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Transcript
Florida Department of Transportation
RICK SCOTT
GOVERNOR
605 Suwannee Street
Tallahassee, FL 32399-0450
ANANTH PRASAD, P.E.
SECRETARY
January 23, 2011
Monica Gourdine
Program Operations Engineer
Federal Highway Administration
545 John Knox Road, Suite 200
Tallahassee, Florida 32303
Re:
Office of Design, Specifications
Section 781
Proposed Specification:7810100 ITS – Motorist Information Systems
Dear Ms. Gourdine:
We are submitting, for your approval, two copies of the above referenced Supplemental
Specification.
This change was proposed by Trey Tillander of the State Traffic Operations and Engineering
Office to update 781-3 to define statewide minimum requirements for DMS capable of
displaying color graphics as well as various types and sizes of signs that are commercially
available and viable for traffic operations. The Method of Measurement and Basis of Payment
are being changed to allow for separate payment of the DMS Sign and the DMS Support
Structure.
Please review and transmit your comments, if any, within two weeks. Comments should be sent
via Email to SP965RP or [email protected]
If you have any questions relating to this specification change, please call Rudy Powell, State
Specifications Engineer at 414-4280.
Sincerely,
Signature on File
Rudy Powell, Jr., P.E.
State Specifications Engineer
RP/ft
Attachment
cc:
Calvin Johnson, Chief Civil Litigation
Florida Transportation Builders' Assoc.
State Construction Engineer
7810100.D02
781 Items
INTELLIGENT TRANSPORTATION SYSTEMS – MOTORIST INFORMATION
SYSTEMS.
(REV 08-29-111-11-12) (REV 12-7-10) (FA 1-24-11) (7-11)
ARTICLE 781-1 (of the Supplemental Specifications) is deleted and the
following substituted:
781-1 Description.
Furnish and installProvide Motorist Information Systems meeting the general
requirements of 781-2, the specific requirements for each system as defined in 781-3
through 781-6 of this specification, and in accordance with the details specified in the
Contract Documents.
ARTICLE 781-3 (of the Supplemental Specifications) is deleted and the
following substituted:
781-3 Dynamic Message Signs.
781-3.1 Sign Types: Dynamic Message Signs must meet the requirements of
NEMA TS4-2005. Dynamic Message Signs (DMS) are classified by the type of sign
display and the type of mechanical construction. Provide monochrome, tri-color, or fullcolor signs as shown in the cContract dDocuments. Use only equipment and components
that meet the requirements of these minimum specifications and are listed on the
Department’s Approved Product List (APL).
781-3.1.1 Front Access DMS: Ensure that front access signs meet the
requirements of NEMA TS4 2005, section 3.2.5.
781-3.1.2 Walk-in DMS: Ensure that walk-in signs meet the requirements
of NEMA TS4 2005, section 3.2.7.
781-3.1.3 Embedded DMS: Embedded DMSs are DMSs that are typically
mounted to Ground Traffic Signs, Overhead Traffic Signs, or Overhead Cantilever
Traffic Signs.
781-3.2 Sign Housing Requirements for all DMS: Ensure that the external skin
of the sign housing is constructed of aluminum alloy 5052 H32 that is a minimum of
0.125 inch thick for walk-in DMS and 0.090 inch thick for front and embedded DMS.
Ensure the interior structure is constructed of aluminum. Ensure that the sign housing
design and appearance is approved by the Engineer. Ensure that no internal frame
connections or external skin attachments rely upon adhesive bonding or rivets.
Ensure the sign enclosure meets the requirements of NEMA TS4 2005,
section 3.1.1. Ensure that all drain holes and other openings in the sign housing are
screened to prevent the entrance of insects and small animals.
Ensure that the sign housing complies with the fatigue resistance
requirements of the fifth edition (2001) American Association of State Highway and
Transportation Officials (AASHTO) Standard Specifications for Structural Supports for
Highway Signs, Luminaires, and Traffic Signals with current addendums. Design and
construct the DMS unit for continuous usage of at least 20 years and the sign structure
for a 50-year design life. Ensure that equipment and structures are designed to withstand
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loads, including a wind load of 150 miles per hour, as defined in the FDOT Structures
Manual without deformation or damage.
Ensure that the top of the housing includes multiple steel lifting eyebolts
or equivalent hoisting points. Ensure hoist points are positioned such that the sign
remains level when lifted. Ensure that the hoist points and sign frame allow the sign to be
shipped, handled, and installed without damage.
Ensure all assembly hardware, including nuts, bolts, screws, and locking
washers less than 5/8 inch in diameter, are type 304 or 316 passivated stainless steel and
meet the requirements of American Society for Testing and Materials (ASTM) F 593 and
ASTM F 594. All assembly hardware greater than or equal to 5/8 inch in diameter must
be galvanized and meet the requirements of ASTM A 307.
Ensure all exterior, excluding the sign face, and all interior housing
surfaces are a natural aluminum mill finish. Ensure signs are fabricated, welded, and
inspected in accordance with the requirements of the current American National
Standard Institute/American Welding Society (ANSI/AWS) Structural Welding CodeAluminum.
Ensure the sign housing meets the requirements of NEMA TS4 2005,
section 3.2.8 for convenience outlets.
781-3.2.1 Sign Housing for Walk-in DMS: Ensure that exterior seams
and joints, except the finish coated face pieces, are continuously welded using an inert
gas welding method. Limit the number of seams on the top of the housing to a maximum
of three. Stitch weld the exterior housing panel material to the internal structural
members to form a unitized structure.
Ensure that exterior mounting assemblies are fabricated from
aluminum alloy 6061-T6 extrusions a minimum of 0.1875 inch thick. Include a minimum
of three 6061-T6 structural aluminum Z members on the rear of the sign housing in
accordance with the Design Standards, Index 18300. Ensure these structural members
run parallel to the top and bottom of the sign housing and are each a single piece of
material that spans the full length of the sign. Ensure these structural members are
attached to the internal framework of the sign.
Ensure hoist points are attached directly to structural frame
members by the sign manufacturer.
Ensure housing access is provided through an access door that
meets the requirements of NEMA TS4 2005, section 3.2.7.1. Ensure the access door
includes a keyed tumbler lock and a door handle with a hasp for a padlock. Ensure the
door includes a closed-cell neoprene gasket and stainless steel hinges.
Ensure the sign housing meets the requirements of
NEMA TS4 2005, section 3.2.7.3 for service lighting. If incandescent lamps are provided,
ensure they are fully enclosed in heavy-duty shatterproof, protective fixtures. Ensure that
incandescent fixtures include aluminum housing and base, a porcelain socket, and clear
glass inner cover. Ensure that all removable components are secured with set screws. If
fluorescent lamps are provided, ensure they are fitted with protective guards.
Ensure that the sign housing includes emergency lighting that
automatically illuminates the interior in the event of a power outage. Emergency lighting
must be capable of operation without power for a minimum of 90 minutes.
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781-3.2.1.1 Walk-in DMS Work Area: Ensure the walk-in DMS
has a work area that meets the requirements of NEMA TS4 2005, section 3.2.7.2. Finish
all edges of the walkway to eliminate sharp edges or protrusions.
781-3.2.2 Sign Housing for Front Access and Embedded DMS: Ensure
front access and embedded signs meet the requirements of NEMA TS4 2005, section
3.2.4. Ensure access does not require specialized tools or excessive force.
781-3.2.3 Housing Face requirements for all DMS: Ensure the sign face
meets the requirements of NEMA TS4 2005, section 3.1.3. Ensure that all sign face
surfaces are finished with a matte black coating system that meets or exceeds American
Architectural Manufacturers Association (AAMA) Specification No. 2605. Provide
certification that the sign face parts are coated with the prescribed thickness. Except for
Embedded DMS, ensure the sign face includes a contrast border that meets the
requirements of NEMA TS4 2005, section 3.1.6.
781-3.2.3.1 Housing Face for Walk-in DMS: No exposed
fasteners shall be allowed on the housing face. Ensure that display modules can be easily
and rapidly removed from within the sign without disturbing adjacent display modules.
781-3.2.3.2 Housing Face for Front Access and Embedded DMS:
Any exposed fasteners on the housing face shall be the same color and finish as the
housing face. Only captive fasteners shall be used on the housing face.
781-3.2.3.3 External Fascia Panels: If the sign includes external
fascia panels, ensure that they are constructed using aluminum. Finish each fascia panel
with a matte black coating system that meets or exceeds AAMA Specification No. 2605.
781-3.2.3.4 Lens Panel Assembly: If sign includes lens panel
assemblies, ensure they are modular in design, removable, and interchangeable without
misalignment of the lens panel and the light-emitting diode (LED) pixels. The lens panel
assembly must consist of an environmental shielding layer coating to protect and seal the
LEDs and internal electronics. The coating shall be a minimum 90% ultraviolet (UV)
opaque. Lens panels must have a matte black coating that meets or exceeds AAMA
Specification No. 2605. Lens panels must include a mask constructed of 0.080 inch
minimum thickness aluminum. Ensure that the mask is perforated to provide an aperture
for each pixel on the display module. Ensure that the apertures do not block the LED
output at the required viewing angle.
781-3.2.4 Sign Housing Ventilation System: The ventilation systems for
walk-in, front-access, and embedded DMS must meet the requirements of
NEMA TS4 2005, section 3.1.2.
Ensure that air drawn into the sign is filtered upon entry. Ensure
the ventilation system is automatically tested once each day and that it may be tested on
command from remote and local control access locations. Ensure the sign includes a
sensor or a sensor assembly to monitor airflow volume to predict the need for a filter
change. Ensure the ventilation system fans possess a 100,000-hour, L10 life rating.
781-3.2.4.1 Ventilation System for Walk-in DMS: Ensure the sign
includes a fail-safe ventilation subsystem that includes a snap disk thermostat that is
independent of the sign controller. Preset the thermostat at 130° F. If the sign housing’s
interior reaches 130° F, the thermostat must override the normal ventilation system,
bypassing the sign controller and turning on all fans. The fans must remain on until the
internal sign housing temperature falls to 115° F.
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781-3.2.5 Sign Housing Temperature Sensor: Ensure that the sign
controller continuously measures and monitors the temperature sensors. Ensure that the
sign blanks when a critical temperature is exceeded and that the sign will report this
event when polled. Ensure that remote and local computers can read all temperature
measurements from the sign controller.
781-3.2.6 Sign Housing Humidity Sensor: Humidity sensors must detect
from 0 to 100% relative humidity in 1% or smaller increments. Sensors must operate and
survive in 0 to 100% relative humidity, and have an accuracy that is better than ±plus or
minus 5% relative humidity. A humidistat is not acceptable.
781-3.2.7 Sign Housing Photosensors: Ensure the sign meets the
requirements of NEMA TS4 2005, section 8.8. Ensure that the sensors provide accurate
ambient light condition information to the sign controller for automatic light intensity
adjustment. Ensure that the automatic adjustment of the LED driving waveform duty
cycle occurs in small enough increments that the sign’s brightness changes smoothly,
with no perceivable brightness change between adjacent levels. Ensure that stray
headlights shining on the photoelectric sensor at night do not cause LED brightness
changes.
Ensure that the brightness and color of each pixel is uniform over
the sign’s entire face within a 30-degree viewing angle in all lighting conditions.
781-3.3: Display Modules: Provide display modules manufactured by one source
and fully interchangeable throughout the manufacturer’s sign system(s). Ensure that
removal or replacement of a complete display module or LED board can be
accomplished without the use of special tools.
Ensure display modules contain solid-state electronics needed to control
pixel data and read pixel status.
Ensure that the sign has a full matrix display area as defined in the
glossary of NEMA TS4 2005.
781-3.3.1 LED and Pixel Specifications: Ensure that LED lamps have a
minimum viewing angle of 30 degrees.
Ensure that all pixels in all signs in a project, including
operational support supplies, have equal color and on-axis intensity. Ensure that the sign
display meets the luminance requirements of NEMA TS4 2005, section 5.4, for light
emitting signs connected at full power. Ensure that amber displays produce an overall
luminous intensity of at least 9200 candelas per square meter when operating at
100% intensity. Provide the LED brightness and color bins that are used in each pixel to
the Engineer for approval. Ensure that the LED manufacturer demonstrates testing and
binning according to the International Commission on Illumination (CIE) 127 (1997)
standard.
Ensure that all LEDs operate within the LED manufacturer’s
recommendations for typical forward voltage, peak pulsed forward current, and other
ratings. Component ratings shall not be exceeded under any operating condition.
Provide a pixel test as a form of status feedback to the
transportation management center (TMC) from the local sign controller. Ensure that the
operational status of each pixel in the sign can be automatically tested once a day.
Ensure that the pixel status test determines the functional status of the pixel as defined by
the pixel Failure Status object in National Transportation Communications for ITS
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Protocol (NTCIP) 1203v0239 and does not affect the displayed message for more than
half a second.
Ensure that LEDs are individually mounted directly on a printed
circuit board (PCB).
781-3.3.2 Optical, Electrical, and Mechanical Specifications for Display
Modules: Ensure the display modules are rectangular and have an identical vertical and
horizontal pitch between adjacent pixels. Ensure that the separation between the last
column of one display module and the first column of the next module is equal to the
horizontal distance between the columns of a single display module. Full-color signs
must have a pitch equal to or less than 35mm.
Ensure that the LED circuit board is a NEMA FR4-rated, single
0.062 inch, black PCB. Ensure that no PCB has more than two PCB jumper wires
present. Finish all PCBs with a solder mask and a component-identifying silk screen.
Provide the LED motherboards with a complete conformal coating
of silicone resin with a minimum thickness of 0.01 inch, except for the pixels on the front
of the PCB. All other PCBs must be provided with a complete conformal coating of
silicone resin with a minimum thickness of 0.01 inch. Meet the material requirements of
MIL-I-46058C Military Standard, United States Department of Defense (USDOD).
Ensure that any devices used to secure LEDs do not block air flow
to the LED leads or block the LED light output at the required viewing angle. Ensure that
all components on the LED side of PCBs are black.
Ensure that there are a minimum of two power supplies that are
wired in a parallel configuration for redundancy. Ensure that if one or 25% of the
supplies in a group, whichever is greater, completely fails, the sign shall still be supplied
with enough power to run 40% of all pixels at a 100% duty cycle with an ambient
operating temperature of 165°F.
Ensure that the sign controller continuously measures and
monitors all LED module power supply voltages and provides the voltage readings to the
TMC or a laptop computer on command.
Ensure that LEDs are protected from external environmental
conditions, including moisture, snow, ice, wind, dust, dirt, and UV rays. Do not use epoxy
to encapsulate the LEDs.
781-3.3.3 Display Area for Walk-in DMS: Ensure that the display area is
capable of displaying three lines of 15 characters using an 18 inch font that meets the
height to width ratio and character spacing in the Manual on Uniform Traffic Control
Devices for Streets and Highways 2009 Edition (MUTCD), section 2L.04, paragraphs 05,
06, and 08.
781-3.4 Characters, Fonts, and Color: Ensure that the signs are capable of
displaying American Standard Code for Information Interchange (ASCII) characters 32
through 126, including all uppercase and lowercase letters and digits 0 through 9, at any
location in the message line. Submit a list of the character fonts to the Engineer for
approval.
All signs must be loaded (as a factory default) with a font in accordance
with or that resembles the standard font set described in NEMA TS4- 2005, section 5.6.
For signs with a pixel pitch of 35mm or less, ensure the sign is loaded (as a factory
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default) with a font set that resembles the Federal Highway Administration (FHWA)
Series E2000 standard font.
Ensure DMS fonts have character dimensions that meet the MUTCD,
section 2L.04, paragraph 08.
Ensure that full-color signs can display the colors prescribed in the
MUTCD, section 1A.12.
781-3.5 Main Power Supply and Energy Distribution Specifications:
Provide a nominal single-phase power line voltage of 120/240 VAC. Ensure
the DMS meets the requirements of NEMA TS4 2005, section 10.2.
Locate all 120 VAC wiring in conduit, pull boxes, raceways, or control
cabinets as required by the National Electrical Code (NEC). Ensure that no 120 VAC
wiring is exposed inside or outside of the sign housing. Do not use the sign housing as a
wiring raceway or control cabinet.
Provide Type XHHW power cables sized as required by the NEC for
acceptable voltage drops while supplying alternating current to the sign.
Provide surge protective devices (SPD) installed or incorporated in the
sign system by the manufacturer to guard against lightning, transient voltage surges, and
induced current. Ensure that SPDs meet or exceed the requirements of Section 785-2.
Ensure SPDs protect all electric power and data communication connections.
781-3.6 Uninterruptible Power Supply (UPS): If a UPS is required in the
cContract dDocuments for walk-in DMS, ensure the UPS is installed within the sign
housing or as shown in the pPlans. If a UPS is required in the cContract dDocuments for
front access and embedded signs, ensure the UPS is installed within the control cabinet
or as shown in the pPlans. The UPS system must be capable of displaying the current
message on a sign when a power outage occurs. Signs with UPS must be able to operate
on battery power and display text messages for a minimum of two hours. Ensure the
system uses sealed absorbed glass mat (AGM) batteries.
781-3.7 Operational Support Supplies: Furnish the operational support supplies
listed in the table below. Promptly replace any of the supplies used to perform a warranty
repair.
For every group of 10 or fewer DMS provided or required, provide one set
of supplies as follows:
1 each
10 each
1 each
1 each
1 each
1 each
2 each
1 each
1 each
10 each
2 each
1 each
Sign controller and I/O board(s)
LED display modules
Display power supply
Uninterruptible power supply
Cable for connecting interface circuits to daughter
boards
Display module cables
Surge suppression sets
Fan assembly
Time relay for fan control
Each type of small fuse (≤ 10 amp)
Each type of large fuse (> 10 amp)
Each type of sensor
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781-3.8 Components: All components must meet the requirements of
NEMA TS4 2005, section 8.
781-3.8.1 Mechanical Components: Ensure that all fasteners, including
bolts, nuts, and washers less than 5/8 inch in diameter, are passivated stainless steel,
Type 316 or Type 304 and meet the requirements of ASTM F 593 and ASTM F 594 for
corrosion resistance. Ensure that all bolts and nuts 5/8 inch and over in diameter are
galvanized and meet the requirements of ASTM A 307. Do not use self-tapping screws.
Ensure that all parts are fabricated from corrosion resistant materials, such as plastic,
stainless steel, aluminum, or brass. Ensure that construction materials are resistant to
fungus growth and moisture deterioration. Ensure that all dissimilar metals are
separated with an inert, dielectric material.
781-3.8.2 Sign Controller: Ensure that the sign controller monitors the
sign in accordance with NEMA TS4 2005, section 9. Ensure the sign monitors the status
of any photocells, LED power supplies, humidity, and airflow sensors. Ensure sign
controllers use fiber optic cables for data connections between the sign housing and
ground-level cabinet.
Ensure that the sign controller meets the requirements of
NEMA TS4 2005, sections 8.9, 8.10. Ensure that the sign controller is capable of
displaying a self-updating time and date message on the sign. Ensure that sign
controllers within ground cabinets are rack-mountable, designed for a standard EIA-310
19 inch rack, and include a keypad and display.
781-3.8.3 Display System Hardware: Ensure the sign utilizes a system
data interface circuit for communications between the sign controller and display
modules. Except for embedded DMS, ensure that the following components reside inside
the sign housing: sign controller (master or slave), display system interface circuits,
display modules, power supplies, local and remote control switches, LED indicators,
Electronic Industries Alliance (EIA)-232 null modem cables (minimum of 4 feet long for
connecting laptop computer to sign controller), and surge protective devices.
781-3.8.4 Control Cabinet: Provide a control cabinet that meets the
requirements of Section 785-4. Ensure that the minimum height of the cabinet is
46 inches.
Provide a ground control cabinet that includes the following
assemblies and components: power indicator, surge suppression on both sides of all
electronics, communication interface devices, connection for a laptop computer for local
control and programming, a 4 foot long cable to connect laptop computers, a workspace
for a laptop computer, and duplex outlets.
Provide for all telephone, data, control, power, and confirmation
connections between the sign and ground control box, and for any required wiring
harnesses and connectors.
781-3.8.5 Sign Controller Communication Interfaces: Ensure the sign
controller has communication interfaces in accordance with NEMA TS4 2005, section
8.7.1. Ensure that EIA-232 serial interfaces support the following:
Data Bits
Parity
7 or 8 bits
Even, Odd, or None
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Number Stop Bits
1 or 2 bit
Ensure the sign controller has a 10/100 Base TX 8P8C port or a
100 Base FX port Ethernet interface.
For dial-up operations, acquire and bear the charges of installing
and connecting the dial-up telephone line. Provide modems to be retained by the
Department at each location. Provide a user-selectable data transmission rate of up to
19.2 kbps for dial-up operations. Ensure that switching between dial-up, Ethernet, and
multidrop operation does not require sign controller software or hardware modifications.
Ensure that the TMC or a laptop computer can be used to remotely
reset the sign controller.
781-3.9 Message and Status Monitoring: Ensure the DMS provides two modes of
operation: (1) remote operation, where the TMC commands and controls the sign and
determines the appropriate message or test pattern; and (2) local operation, where the
sign controller or a laptop computer commands and controls the sign and determines the
appropriate message or test pattern.
Ensure that the sign can perform the following functions:
1. Control Selection – Ensure that local or remote sign control can
be selected. Ensure that there is a visual indicator on the controller that identifies
whether the sign is under local or remote control.
2. Message Selection – Ensure that the sign controller can select a
blank message or any one of the messages stored in the sign controller’s nonvolatile
memory when the control mode is set to local.
3. Message Implementation – Ensure that the sign controller can
activate the selected message.
Ensure that the sign can be programmed to display a user-defined
message, including a blank page, in the event of power loss.
Ensure that message additions, deletions, and sign controller changes may
be made from either the remote TMC or a local laptop computer. Ensure that each font
may be customized, and modifications to a font may be downloaded to the sign controller
from the TMC or a laptop computer at any time without any software or hardware
modifications.
Ensure that there is no perceivable flicker or ghosting of the pixels during
sign erasure and writing periods.
781-3.10 TMC Communication Specification for all DMS: Ensure that the sign
controller is addressable by the TMC through the Ethernet communications network
using software that complies with the NTCIP 1101 base standard (formerly the
NEMA TS 3.2 -1996 standard), including all amendments as published at the time of
contract letting, the NTCIP Simple Transportation Management Framework, and
conforms to Compliance Level 1. Ensure that the software implements all mandatory
objects in the supplemental requirement SR-781-3-1, FDOT Dynamic Message Sign
NTCIP Requirements, as published on the FDOT State Traffic Engineering and
Operations Office web site at the time of contract letting. Ensure that the sign complies
with the NTCIP 1102v01.15, 2101 v01.19, 2103v02.07, 2201v01.15, 2202 v01.05, and
2301v02.19 standards. Ensure that the sign complies with NTCIP 1103v02.17, section 3.
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Ensure that the controller’s internal time clock can be configured to
synchronize to a time server using the network time protocol (NTP). NTP synchronization
frequency must be user-configurable and permit polling intervals from once per minute to
once per week in one-minute increments. The controller must allow the user to define the
NTP server by internet protocol (IP) address.
Provide communications line circuits that are point-to-point or multipoint,
and that provide full duplex asynchronous data transmissions at the rate shown in the
contract documents or directed by the Engineer.
Assign each sign controller a unique address.
781-3.11 Sign Control Software: Ensure that the sign is provided with computer
software from its manufacturer that allows an operator to program, operate, exercise,
diagnose, and read current status of all sign features and functions using a laptop
computer. Ensure that sign control software provides a graphical representation that
visibly depicts the sign face and the current ON/OFF state of all pixels as well as allows
messages to be created and displayed on the sign. Ensure that the laptop computer and
sign can communicate when connected directly by an EIA-232 cable and via Ethernet.
Ensure that the software will allow communication between multiple users and multiple
signs across the same communication network.
781-3.12 Sign Support Structure: Meet the requirements of 700-2.4.
781-3.13 Installation Requirements: Provide Wwalk-in DMS for locations over
interstate travel lanes. Do not install the sign prior to the availability of electric power.
Verify that any ventilation system incorporated within the sign is operational within
72 hours after sign installation.
Ensure that the location of the lifting eyebolts, left in place or removed, is
sealed to prevent water entry after installation.
Load the initial message libraries on both the sign control software and
the sign controller. The Engineer will furnish the messages to be placed in these
libraries.
781-3.14 Documentation: Provide documentation for electronic equipment in
accordance with Section 603-8.
781-3.15 Licensing: Ensure that the manufacturer grants the Department a
license that allows the Department to use and internally distribute any and all sign
communications protocols, operating systems, drivers, and documentation.
781-3.16 Technical Assistance: Ensure that a manufacturer’s representative is
available to assist the Contractor’s technical personnel during pre-installation testing
and installation.
Do not provide initial power to the sign(s) without the permission of the
manufacturer’s representative.
781-3.17 Environmental Requirements: The DMS must meet the requirements of
NEMA TS4 2005, section 2.
781-3.18 Pre-installation Field Testing: Conduct pre-installation tests on all
units at a Contractor-provided facility within the appropriate District. Perform the tests
on each unit supplied to verify that no damage was done to any sign during the shipment
and delivery process. Notify the Engineer a minimum of 10 calendar days before the start
of any tests. Conduct all tests according to the approved test procedures detailed in this
section. Each DMS must pass the individual tests detailed below prior to installation.
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781-3.18.1 Material Inspection: Examine each DMS carefully to verify
that the materials, design, construction, markings, and workmanship comply with all
applicable standards, specifications, and requirements.
781-3.18.2 Operational Test: Operate each DMS long enough to permit
equipment temperature stabilization, and to check and record an adequate number of
performance characteristics to ensure compliance with applicable standards,
specifications, and requirements.
781-3.18.3 Pre-installation Test Failure Consequence: If any unit fails,
the unit shall be corrected or another unit substituted in its place and the test repeated.
If a unit has been modified as a result of a failure, a report shall be
prepared and delivered to the Engineer. The report shall describe the nature of the
failure and the corrective action taken.
If a failure pattern develops, the Engineer may direct that design
and construction modifications be made to all units without additional cost to the
Department or an extension of the contract period.
781-3.19 Installed Site Tests: Conduct an approved, stand-alone equipment
installation test at the field site. Test all stand-alone (i.e., non-network) functions of the
field equipment using equipment installed as detailed in the pPlans and as approved by
the Engineer.
Complete approved data forms and turn them over to the Engineer for
review and as a basis for rejection or acceptance. Provide a minimum notice of
30 calendar days prior to all tests to permit the Engineer or his representative to observe
each test.
If any unit fails to pass its stand-alone test, correct the unit or substitute
another unit in its place, then repeat the test.
If a unit has been modified as a result of a stand-alone test failure,
prepare a report describing the nature of the failure and the corrective action taken and
deliver it to the Engineer prior to re-testing the unit. If a failure pattern develops, the
Engineer may direct that design and construction modifications be made to all units
without additional cost to the Department or an extension of the contract period.
781-3.20 System Testing: Conduct approved DMS system tests on the field
equipment with the master equipment including, at a minimum, all remote control
functions. Display the return status codes from the sign controller for a minimum of
72 hours. Complete approved data forms and turn them over to the Engineer for review,
and as a basis for rejection or acceptance.
Demonstrate the sign’s ability to display the proper predefined message or
remain blank when power is restored following an AC power interruption.
If the system test fails because of any subsystem component, repair that
component or substitute another in its place, then repeat the test. If a component has
been modified as a result of a system test failure, prepare a report and deliver it to the
Engineer prior to retesting.
781-3.21 Operational Testing: After the system testing is successfully completed,
conduct one continuous 72-hour, full-operating test prior to conducting the 60-day
acceptance test. The Engineer will approve the type of tests to be conducted. Include in
the tests all control, monitoring, and communications functions of the field equipment by
the master equipment.
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781-3.22 Acceptance Testing: Conduct a 60-day acceptance test after the
successful completion of the approved 72-hour operational test. During the 60-day test
period, limit downtime due to mechanical, electrical, or other malfunctions to a
maximum total of five calendar days. If the equipment fails to operate for a total of five or
more calendar days, testing will be restarted. The Engineer may select to pause and
extend the 60-day test period by the number of days lost by failure and repair time in lieu
of restarting the full 60-day test. The Engineer will furnish the Contractor with a letter of
approval and completion stating the first and last day of the 60-day test period.
781-3.1 Dynamic Message Sign with 18” Character Display (18” DMS):
Furnish and install an 18” DMS in accordance with the details specified in the Contract
Documents. Use only equipment and components that meet the requirements of these
minimum specifications, and are listed on the Department’s Approved Product List
(APL).
781-3.1.1 General: Ensure that all exposed material is corrosion resistant.
Ensure that the electronic equipment associated with the sign remains secure from
damage and protected from moisture, dust, dirt, and corrosion.
Ensure that ambient magnetic or electromagnetic fields, including
those created by any system components, have no negative effects on system
performance. Ensure that the system does not conduct or radiate signals that interfere
with other electrical or electronic equipment including, but not limited to, other control
systems and data processing, audio, radio, and industrial equipment.
Ensure that the sign housing complies with the fatigue resistance
requirements of the fifth edition (2001) AASHTO Standard Specifications for Structural
Supports for Highway Signs, Luminaires, and Traffic Signals with current addendums.
Design and construct the DMS unit for continuous usage of at least 20 years and the sign
structure for a 50-year design life. Ensure that equipment and structures are designed to
withstand the wind loads defined in the FDOT Structures Manual without deformation or
damage.
Ensure that the sign is fabricated, welded, and inspected in
accordance with the requirements of the current ANSI/AWS Structural Welding CodeAluminum. Ensure that all identification markings on the sign and its components,
including but not limited to panels, terminal blocks, and printed circuit boards, are silkscreened and sealed or otherwise indelible. Ensure that the equipment design allows
access and maintenance without special tools. Ensure that all component parts are readily
accessible for inspection and maintenance. Provide labeled test points for checking
essential voltages. Ensure that all external connections are terminated using connectors.
Key the connectors to preclude improper hookups. Provide a clear removable cover
measuring 0.125 inch thick to cover all exposed power terminals. Ensure that the covers
do not interfere with sign functions or maintenance operations.
Ensure that the sign provides a minimum legible viewing distance
that includes the area from 100 to a minimum of 1100 eet in advance of the sign. Ensure
that the sign is legible for a minimum of 10 seconds when viewed from an approaching
vehicle moving at the posted speed limit.
781-3.1.2 Sign Housing: Ensure that the external skin of the sign housing
is constructed of aluminum alloy 5052 H32 that is a minimum of 0.125 inch thick. Ensure
that the sign housing design and appearance is approved by the Engineer. If cable
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attachments are used in the sign housing, the cables shall be securely clamped using a
method approved by the Engineer. No adhesive attachments shall be allowed.
Ensure that exterior seams and joints, except the finish coated face
pieces, are continuously welded using an inert gas welding method. Limit the number of
seams on the top of the housing to a maximum of three. Stitch weld the exterior housing
panel material to the internal structural members to form a unitized structure.
Ensure that exterior mounting assemblies are fabricated from
aluminum alloy 6061-T6 extrusions a minimum of 0.1875 inch thick. Include a
minimum of three 6061-T6 structural aluminum Z members on the rear of the sign
housing in accordance with the Design Standards, Index 18300. Ensure these structural
members run parallel to the top and bottom of the sign housing and are each a single
piece of material that spans the full length of the sign. Ensure the top member is placed
within twelve inches from the top edge of the housing. Ensure the bottom member is
placed within twelve inches from the bottom edge of the housing. Ensure these structural
members are attached to the internal framework of the sign.
Ensure that the bottom panel of the sign housing includes a
minimum of four drain holes with replaceable plugs that serve to open and close the
drain. Ensure that the drain holes are centered from the front to the back of the housing,
and equally spaced across the housing’s full length. Ensure that all drain holes and other
openings in the sign housing are screened to prevent the entrance of insects and small
animals. Ensure that the bottom panels are sloped towards the drain holes to prevent
water accumulation on the interior surfaces of the sign bottom.
Ensure that the top of the housing includes multiple steel lifting
eyebolts or equivalent hoisting points. Ensure hoist points are attached directly to
structural frame members by the sign manufacturer. Ensure hoist points are positioned
such that the sign remains level when lifted. Ensure that the hoist points and sign frame
allow the sign to be shipped, handled, and installed without damage.
Ensure all assembly hardware, including nuts, bolts, external
screws and locking washers less than 5/8 inch in diameter, are Type 304 or 316
passivated stainless steel and meet the requirements of ASTM F 593 and ASTM F 594.
All assembly hardware greater than or equal to 5/8 inch in diameter must be galvanized
and meet the requirements of ASTM A 325.
781-3.1.2.1 Interior Structure: Ensure that framing structural
members are constructed of aluminum alloy (6061 T6 or 6063 T5) a minimum of
0.1875 inch thick.
Construct the sign housing with a minimum width of 34
inches. Provide an interior walkway with a minimum width of 2 feet. Ensure that the
walkway area maintains a minimum of 2 feet of horizontal clear area and 6 feet of clear
height along the sign housing’s entire length. Fabricate the walkway from diamond tread
plate 6061-T6 or 3003-H22 aluminum that is 0.125 inch thick. Finish all edges of the
walkway to eliminate sharp edges or protrusions.
781-3.1.2.2 Housing Face: Ensure that housing face consists of
internal structural members, external fascia panels, and lens panel assemblies. Do not
allow exposed fasteners on the housing face.
781-3.1.2.2.1 Internal Structural Members: Ensure that
internal structural members are constructed of extruded aluminum and accommodate both
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display module mounting and air distribution. Ensure that the internal structural members
retain the display modules in a manner that facilitates the easy and rapid removal of each
display module from within the sign without disturbing adjacent display modules.
781-3.1.2.2.2 External Fascia Panels: Ensure that external
fascia panels are constructed using aluminum. Ensure fascia panels are sealed to prevent
intrusion of water, moisture, dust, dirt, and other contaminants into the sign interior.
Finish each fascia panel with a matte-black coating system that meets or exceeds
American Architectural Manufacturers Association (AAMA) Specification No. 2605.
Ensure that the external fascia perimeter panels are a minimum of 1 foot wide. Ensure
that external fascia interline panels are a minimum of 9 inches wide.
781-3.1.2.2.3 Lens Panel Assembly: Provide lens panel
assemblies that are modular in design, removable, and interchangeable without
misalignment of the lens panel and the LED pixels, and that are removable from within
the main sign housing. Ensure that lens panels include a mask constructed of 0.080 inch
minimum thickness aluminum with a matte black coating that meets or exceeds AAMA
Specification No. 2605 with a minimum thickness of 0.04 inch. Ensure that the mask is
perforated to provide an aperture for each pixel on the display module. Ensure that the
apertures are uniform, centered over each pixel, and as small as possible, without
blocking the LED output at the required viewing angle.
Ensure the lens panel assembly consists of LEDs,
other internal electronics, an aluminum mask, and an environmental shielding layer
coating to protect and seal the LEDs and other internal electronics. The coating shall be a
minimum 90% ultraviolet (UV) opaque.
781-3.1.2.3 Sign Housing Surface Finish: Ensure that all sign
face surfaces are finished with a matte black FP-based coating system that meets or
exceeds AAMA Specification No. 2605. Provide certification that the sign face parts are
coated with the prescribed thickness. Ensure all other exterior and all interior housing
surfaces are a natural aluminum mill finish. No interior painted surfaces will be allowed.
781-3.1.2.4 Sign Housing Access Door: Provide a three-point,
lockable, aluminum access door at the end of the housing, as depicted in the plans, to
permit easy access to the walk-in housing. The access door shall be a minimum height of
80 inches and a minimum width of 2 feet. Outfit the door with a handle-operated locking
mechanism, closed-cell neoprene gasket, and stainless steel hinges.
Furnish a locking mechanism that is a Grade 1 three-point,
center-case dead bolt lock conforming to ANSI/BHMA Standard A156.2 and having a
zinc finish. Provide a handle on both the inside and outside of the door. Ensure that
handles are heavy duty, industrial strength, and corrosion resistant. Include a device in
the door assembly to hold the door open at 90 degrees. Ensure that the door is monitored
electronically by the sign controller and provides an alert to transportation management
center (TMC) personnel whenever the door is opened.
781-3.1.2.5 Sign Housing Ventilation System: Provide a
ventilation system that distributes air over all LEDs, power supplies, and communication
devices inside the sign housing. Ensure that air circulation is evenly distributed across
display modules, in the cavity between each display module, across lens panels and the
back of the display modules. Submit ventilation system design calculations to the
Engineer for approval.
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Ensure that air drawn into the sign is filtered upon entry.
Ensure that filters remove airborne particles measuring 500 microns in diameter and
larger.
Ensure that the ventilation system is automatically tested
once each day, and that it may be tested on command from remote and local control
access locations. Ensure that the sign controller will send an error message to the TMC or
a laptop computer when a failure occurs. Ensure that the sign is capable of operating
without any decrease in performance over an ambient operating temperature range of 29° to 165°F as per NEMA TS 4, Subsection 2.1.5.1, with a maximum relative humidity
of 100%.
Ensure that the sign includes a fail-safe ventilation
subsystem that includes a snap disk thermostat that is independent of the sign controller.
Preset the thermostat at 130°F. If the sign housing’s interior reaches 130°F, the
thermostat will override the normal ventilation system, bypassing the sign controller and
turning on all sign ventilation fans. The fans will remain under the control of the
thermostat until the internal sign housing temperature falls to 115°F, at which time the
fail-safe subsystem will return control of the ventilation system to the sign controller.
Ensure that the sign includes a manual override timer
switch located just inside the access door to manually activate the ventilation system. The
switch must be adjustable up to four hours.
Ensure that the sign includes a sensor or a sensor assembly
to monitor airflow volume to predict the need for a filter change. Ensure that the
ventilation system fans possess a 100,000-hour L10 life rating.
781-3.1.2.6 Sign Housing Temperature Sensor: Ensure that the
sign controller continuously measures and monitors the temperature sensors. Ensure that
the sign can be programmed to blank when a user-defined critical temperature is
exceeded. Ensure that the sign will report such events when polled. Ensure that the userselectable, critical temperature may be changed by remote and local control access.
Ensure that remote and local computers can read all temperature measurements from the
sign controller. When the sign reaches a temperature that is 2°F lower than the critical
high temperature, ensure that the sign controller will decrease the LED intensity to half
its normal brightness.
781-3.1.2.7 Sign Housing Humidity Sensor: Ensure the sign
includes a humidity sensor that detects from 0 to 100% relative humidity in 1% or
smaller increments. Ensure that the sensor will operate and survive in 0 to 100% relative
humidity, and has an accuracy that is better than ±5% relative humidity. A humidistat is
not acceptable.
781-3.1.2.8 Photoelectric Sensor Devices: Ensure the sign
electronics monitor ambient light using a minimum of three photocells. Ensure that the
photocells are placed so they measure light levels on the front and rear of the sign, and
ambient light conditions at the sign location. Ensure that the devices provide accurate
ambient light condition information to the sign controller for automatic light intensity
adjustment. Ensure that the automatic adjustment of the LED driving waveform duty
cycle occurs in small enough increments that the sign’s brightness changes smoothly,
with no perceivable brightness change between adjacent levels. Ensure that stray
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headlights shining on the photoelectric sensor at night do not cause LED brightness
changes.
Supply the sign with a brightness-versus-ambient light
matrix table with algorithms and/or other means of calculation that enables the sign to
automatically adjust LED output according to ambient light level. Ensure the sign
controller monitors the photocell circuits in the sign and correlates the readings with the
brightness table to convert the measured light intensity into the desired pixel brightness.
Ensure that the brightness table has a minimum of 255 levels. Ensure that the brightness
table in each individual sign controller is adjustable from the TMC or a laptop computer,
and can be customized according to each installation site’s requirements. Ensure that the
sign controller automatically controls the pixel brightness to compensate for differences
in ambient light levels, such as the differences in day and night. In addition to the
automatic mode, ensure that the brightness may be set from 1% to 99% in 1% increments
manually from the front panel of the sign controller and remotely from the TMC.
Ensure that the brightness and color of each pixel is
uniform over the sign’s entire face within a 30 degree viewing angle from 200 to
1,100 feet in all lighting conditions. Non-uniformity of brightness or color over the sign’s
face shall be cause for rejection of the sign.
781-3.1.2.9 Sign Housing Internal Lighting and Electrical
Outlets: Furnish the sign housing with a minimum of four internal fluorescent or
incandescent light fixtures. Near the door, locate a 12-hour timer without a hold feature
for the lights.
If incandescent lamps are provided, ensure that they are
spaced evenly above the walkway and fully enclosed in heavy-duty shatterproof,
protective fixtures. Ensure that incandescent fixtures include aluminum housing and base,
a porcelain socket, and clear glass inner cover. Ensure that all removable components are
secured with set screws.
If fluorescent lamps are provided, ensure that the fixtures
are spaced evenly above the walkway and fitted with protective guards.
Ensure that the sign housing includes emergency lighting
that automatically illuminates the interior in the event of a power outage.
Ensure that the light produced from internal lighting is not
visible from outside the sign during nighttime or other dark conditions and does not
interfere with normal visible operation of the sign.
Equip each sign housing with at least three 15-amp, 120volt rated ground fault interrupter (GFI) outlets that include protected duplex electrical
receptacles. Locate one duplex receptacle near each end of the sign housing. Space the
duplex receptacles evenly on the rear wall of the housing. Receptacles must all be at the
same height and be 12 to 48 inches above the walkway.
781-3.1.3 Display Modules: Provide display modules manufactured by
one source and fully interchangeable throughout the manufacturer’s sign system(s).
Ensure that removal of a single display module does not impact the operation of other
display modules. Ensure that removal or replacement of a complete display module or
LED board can be accomplished without the use of any tools.
Ensure display modules contain solid-state electronics needed to
control pixel data and read pixel status.
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781-3.1.3.1 Line Matrix Display Module: Assemble display
modules in a line matrix configuration consisting of three lines of 25 display modules per
line. Ensure each line consists of an array, 7 pixels high by 125 pixels wide, allowing an
18-inch-high display of 5 pixel by 7 pixel characters per line with double-column spacing
between the characters. Ensure that the line matrix display module includes an LED
board containing a minimum of 35 pixels in a 5 pixel by 7 pixel configuration capable of
displaying 18 inch dot matrix characters.
781-3.1.3.2 Full Matrix Display Module: Assemble display
modules to form a full matrix configuration consisting of three lines of 25 display
modules per line providing an arrangement of 27 pixels by 125 pixels. Ensure that the
display will allow an 18-inch-high display per line with 5 pixel by 7 pixel characters and
double-column spacing between the characters. Ensure that the full matrix display
module includes an LED board containing 45 pixels arranged uniformly in 5 columns of
9 pixels each to form a 5 pixel by 9 pixel array capable of displaying 18-inch dot matrix
characters.
781-3.1.3.3 LED and Pixel Specifications: Ensure that the sign
utilizes amber LED lamps with a minimum viewing angle of 30 degrees and a peak
wavelength of 590 nanometers. Ensure that the LED peak wavelength output varies no
more than ±2 nanometers. Ensure that the LED pixel cone of vision is a minimum of
30 degrees (centered around the optical axis, or zero point, of the pixel). The cone
perimeter is defined by the point where light output intensity is 50% of the intensity
measured at the zero point of the pixel.
Ensure that each pixel has a diameter of 1.5 inches, plus or
minus 10%, and that the LEDs in each pixel are clustered to maximize long-range
visibility. Ensure that all pixels in all signs in a project, including operational support
supplies, have equal color and on-axis intensity. Ensure that the sign display produces an
overall luminous intensity of at least 9200 candelas per square meter when operating at
100% intensity. Measure the brightness of each LED in accordance with the International
Commission on Illumination’s (CIE) requirements as detailed in Test Method A of the
CIE 127 (1997) standard. Provide the LED brightness and color bins that are used in each
pixel to the Engineer for approval. Provide a letter of certification from the LED
manufacturer that demonstrates testing and binning according to the CIE 127 (1997)
standard.
Ensure each pixel contains two interlaced strings of LEDs.
Ensure that all LEDs operate within the LED manufacturer’s recommendations for
typical forward voltage, peak pulsed forward current, and other ratings. Component
ratings shall not be exceeded under any operating condition. Ensure that LED failure in
one string within a pixel does not affect the operation of any other string or pixel.
Provide a pixel test as a form of status feedback to the
TMC from the local sign controller. Ensure that the operational status of each pixel in the
sign can be automatically tested once a day. The operational status may also be tested
when the TMC or a laptop computer prompts a pixel test. Ensure that a log file can be
created containing a list of defective pixels as transmitted to the TMC or a laptop
computer. Ensure that the log file includes the pixel status, module number, column
number, and pixel number. Ensure that the pixel status test determines the functional
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status of the pixel as stuck-on or stuck-off and does not affect the displayed message for
more than half a second.
Ensure that LEDs are individually mounted directly on a
Printed Circuit Board (PCB), and are individually removable and replaceable using
conventional electronic repair methods.
781-3.1.3.4 Optical, Electrical, and Mechanical Specifications
for Display Modules: Ensure that each display module contains connectors for power,
controls, and data; contains display module control electronics and memory elements;
and provides the signals to switch the LED pixels.
Ensure the display modules are rectangular and have an
identical vertical and horizontal center-to-center distance (i.e., pitch) between adjacent
pixels ranging from 2.6 inches to 2.75 inches. Ensure that the separation between the last
column of one display module and the first column of the next module is equal to the
horizontal distance between the columns of a single display module.
Ensure that the LED circuit board is a NEMA FR4-rated,
single 0.062-inch, black PCB. Ensure that alternate LED board configurations are
submitted to and pre-approved by the Engineer prior to installation. Ensure that PCBs
enable components to be removed and replaced without damage to boards, traces, or
tracks. Ensure that the intercomponent wiring is a copper-clad track having a minimum
weight of 2 ounces per square foot with an adequate cross section for carrying circuit
current. Ensure that no PCB has more than two PCB jumper wires present. Finish all
PCBs with a solder mask and a component-identifying silk screen.
Provide all PCBs, except for the LED motherboard and
power supply PCBs, with a complete and conformal coating of silicone resin with a
minimum thickness of 0.01 inch. Provide the LED motherboards with a complete
conformal coating of silicone resin with a minimum thickness of 0.01 inch, except for the
pixels on the front of the PCB. Meet the material requirements of MIL-I-46058C Military
Standard, United States Department of Defense (USDOD).
Mount all LEDs so that the mechanical axis of the LED is
±1 degree to the sign’s face to ensure uniformity of brightness over the sign’s face.
Ensure that LEDs are secured perpendicular to the display module within 0.5 degree.
Ensure that any devices used to secure LEDs do not block air flow to the LED leads or
block the LED light output at the required viewing angle. Ensure that all components on
the LED side of PCBs are black.
Ensure that the voltage to the LED modules and their
associated electronics does not exceed 25 VDC. Ensure that there are a minimum of two,
and a maximum of four, power supplies that are wired in a parallel configuration for
redundancy. Ensure that multiple power supplies are used to provide power to each
display module. Ensure the voltage measured at the display modules does not vary more
than 50 millivolts over all the display modules in the sign with 17 pixels on at 100%
intensity in each display module. Ensure that if one supply completely fails, the sign shall
still be supplied with enough power to run 40% of all pixels at a 100% duty cycle with an
ambient operating temperature of 165°F. Ensure that the supplies have a current sharing
capability that allows them to provide equal amounts of current to their portion of the
LED display.
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Ensure that the sign controller continuously measures and
monitors all LED module power supply voltages and provides the voltage readings to the
TMC or a laptop computer on command. Ensure that an error message will be sent to the
TMC or a laptop computer when it polls the sign controller if voltages measured are
outside nominal values.
Ensure that LEDs are protected from external
environmental conditions, including moisture, snow, ice, wind, dust, dirt, and UV rays.
Do not use hoods, louvers, cylinders or visors that could impede the free flow of air over
any surface of each individual LED. Do not use epoxy to encapsulate the LEDs.
781-3.1.4 Character Displays: Ensure that the signs are capable of
displaying American Standard Code for Information Interchange (ASCII) characters 32
through 126, including all uppercase and lowercase letters and digits 0 through 9, at any
location in the message line.
Ensure that the uppercase alphanumeric characters are displayed
over the complete height of the matrix. Submit a list of the character fonts to the Engineer
for approval.
Characters must be legible under all light conditions at a distance
ranging from 100 to 1,100 feet within the 30 degree cone of vision centered on the pixel’s
optical axis. Ensure that the operator is able to display compressed (i.e., 4 pixel by 7
pixel), expanded (i.e., 6 pixel by 7 pixel), or double-stroke (i.e., 7 pixel by 7 pixel)
character fonts, and to change the default spacing between characters. Ensure that the
spacing options include 1-, 2-, or 3-pixel columns between the characters. Ensure the
system is loaded with a default font in accordance with the Standard Font set described in
NEMA TS4-2005 (section 5.6). Ensure the system allows the assignment of font access
privileges. Ensure that the sign controller is capable of a self-updating time and/or date
display on the sign.
781-3.1.5 Main Power Supply and Energy Distribution Specifications:
Provide a nominal single-phase power line voltage of 120/240 VAC protected by one 60amp, two-pole (i.e., common trip) main circuit breaker for the sign and its controller.
Ensure that the system operates within a voltage range of 97 to 135 VAC as specified in
NEMA TS 4, Subsection 2.1.3.1.
Ensure that all service lines inside the sign housing are supplied by
120 VAC independently protected by a thermomagnetic circuit breaker at the sign
housing’s entry point. Locate all 120 VAC wiring in conduit, pull boxes, raceways, or
control cabinets as required by the NEC. Ensure that no 120 VAC wiring is exposed inside
or outside of the sign housing. Do not use the sign housing as a wiring raceway or control
cabinet.
Ensure that the sign and its controller have an operating frequency
of 60 hertz (Hz), ±3.0 Hz, as stated in NEMA TS 4, Subsection 2.1.3.2. Ensure that the
drop in the unit’s voltage between no-load and full-load during normal operations does
not exceed 10% of the nominal voltage. Provide power protection through the use of a
thermomagnetic circuit breaker connected to a 5-milliampere GFI device that protects all
service outlets. Provide a 100-amp 120/240 VAC two-pole load center with a 20-circuit
capability. Provide separate circuit breakers for each sign circuit.
Provide Type XHHW power cables sized as required by the NEC
for acceptable voltage drops while supplying alternating current to the sign. Ensure that
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the sign power consumption does not exceed 7,000 VA under any circumstance,
including operation of the fans, heaters (if provided within the sign), sign controllers and
communication equipment, and all pixels illuminated at 100% brightness.
Provide protection devices such as surge suppressors and lightning
arrestors installed or incorporated in the sign system by the manufacturer to guard against
lightning, transient voltage surges, and induced current. Ensure that the protection
devices meet or exceed the device protection requirements as contained in Section 785-2.
Use protection devices on all electric power and data communication connections.
Ensure that the DC and AC voltage ratings and dissipation factors
of capacitors used in the sign system exceed the worst-case design parameters of the
circuitry by 50%. Ensure that capacitors that are not surface mount components are
mechanically supported by a clamp or fastener that is resistant to cracking, peeling, and
discoloration.
Ensure that resistors used in the sign are within 5% of the tolerance
of the specified temperature range and, when operated in excess of 50% of its power
rating, have an adequate heat sink.
Ensure all transistors, integrated circuits, and diodes are a standard
type, listed by the EIA, and clearly identifiable.
781-3.1.6 Uninterruptible Power Supply: Provide each sign with an
uninterruptible power supply (UPS) capable of maintaining and continuing the operation
of the sign and its related communication device for a minimum of two hours. Provide
sealed AGM type batteries that are maintenance free. Ensure that the UPS is installed
within the sign housing or as shown in the plans.
781-3.1.7 Operational Support Supplies: Furnish the operational support
supplies listed in the table below. Promptly replace any of the supplies used to perform a
warranty repair.
For every group of 10 or fewer 18” DMS provided or required,
provide 1 set of supplies as follows:
1 each
10 each
1 each
1 each
1 each
1 each
2 each
1 each
1 each
10 each
2 each
1 each
Sign Controller
LED Display Modules
Uninterruptible Power Supplies
System Interface Circuit
Cable for connecting interface circuits to daughter
boards
Display Module Cables
Surge Suppression Sets
Fan Assembly
Time Relay for Fan Control
Every Small Fuse (≤ 10 amp)
Every Large Fuse (> 10 amp)
Sensor for each type of sensor
The Engineer will review and approve the operational support
supplies.
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781-3.1.8 Sign Controller: Ensure that the sign is provided with a sign
controller that includes operational firmware stored in nonvolatile memory. Program the
controller to receive sign control commands from the TMC, to transmit responses (as
requested) to the TMC, and to control sign operation and message displays. Ensure that
sign controller functions include error logging and reporting, and providing the
operational status of the sensors including temperature, photocell, airflow, humidity, and
LED power supply sensors.
Ensure that the sign controller will read the internal temperature
sensors, the external ambient temperature sensors, and the humidity sensors and use the
readings in an algorithm that turns on heat tape and/or fans, when conditions warrant, to
prevent frost on the face of the sign and condensation on the display modules and other
electronic circuitry.
Ensure that the sign controller receives and sends messages by way
of an Ethernet network and that the failure of any sign does not affect the operation of
any other sign in the system.
Ensure that, at a minimum, the sign controller consists of local
control panel status indicators including power on/off, TMC communication status,
laptop computer communication status, communication status with the electronics in the
walk-in housing, and sign diagnostics and error status.
Ensure that the controller provides power-up and automatic restart
capabilities with automatic sign blanking when recovering from a power-off condition.
Ensure that the sign can be configured to either display a stored message or blank upon
recovery from power loss and upon recovery from system resets. Utilize a hardware
watchdog circuit to provide automatic recovery from critical errors and automatic
shutdown in the event of critical hardware failure.
Ensure that there is a ground level access point at the location
shown in the plans and an access point within the sign that allows the sign to be
programmed and controlled locally using a laptop computer.
781-3.1.9 Display System Hardware: Ensure the sign utilizes a system
data interface circuit for communication between the sign controller and display modules.
Ensure the following components reside inside the walk-in housing: sign controller,
display system interface circuits, display modules, power supplies, local and remote
control switches, LED indicators, an Electronic Industries Alliance (EIA)-232 plug-in
connection for laptop computers, EIA-232 null modem cables (minimum of 4 feet long
for connecting laptop controller to sign controller), workspace for a laptop computer,
communication equipment and surge protective devices.
781-3.1.10 Control Cabinet: Provide a control cabinet that meets the
requirements of Section 785-4. Ensure that the minimum height of the cabinet is
46 inches.
Equip the ground control cabinet with the following assemblies
and components, unless otherwise specified in the plans: power indicator, surge
suppression on both sides of all electronics, communication interface devices, connection
for a laptop computer for local control and programming, cables a minimum of 4 feet
long to connect laptop computers, and duplex outlets.
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Provide for all telephone, data, control, power, and confirmation
connections between the sign and ground control box, and for any required wiring
harnesses and connectors.
781-3.1.11 Sign Controller Communication Interface: Ensure that the
sign controller includes two separate EIA-232 serial interfaces inside the sign housing for
communication with the TMC or a laptop computer, and one Ethernet 10/100 Base TX
8P8C port. Ensure that EIA-232 serial interfaces support the following:
Data Bits: 7 or 8 bits
Parity: Even, Odd, or None
Number Stop Bits: 1 or 2 bit
Ensure that all Category 5 unshielded twisted pair/shielded twisted
pair network cables are compliant with the EIA/TIA-568-A standard.
Configure one EIA-232 serial interface to drive asynchronous
modems for full duplex communication with the TMC over point-to-point dial-up lines or
a multidrop fiber or copper network. Ensure that switching between dial-up, Ethernet,
and multidrop operation does not require sign controller software or hardware
modifications.
For dial-up operations, acquire and bear the charges of installing
and connecting the dial-up telephone line. Provide modems to be retained by the
Department at each location. Provide a user-selectable data transmission rate of up to
19.2 kbps for dial-up operations.
Configure the second EIA-232 serial port for local communication
with a laptop computer.
Ensure that the sign controller can be managed remotely from a
TMC or locally using a laptop computer. Ensure that the TMC or a laptop computer can
be used to remotely reset the sign controller.
Ensure that the sign controller and its software will display singlepage and multi-page messages, with mixed fonts and spacing. Ensure that message page
times and text flashing rates are programmable between 0.5 and 5 seconds in 0.1 second
increments.
Ensure that the sign system will log and report errors and failures,
including data transmission errors, receipt of invalid data, communication failure
recoveries, alternating current power failures, power recoveries, pixel status reads, fan
and filter airflow status, temperature status, power supply status, and information on the
operational status of the temperature, photocell, airflow, humidity, and LED power
supply sensors. Ensure that airflow and humidity sensor information is reported using the
objects from the dmsClimateCtrlStatusTable of the NTCIP 1203 V2 standard.
781-3.1.12 Message and Status Monitoring: Ensure that the sign
provides two modes of operation: (1) master operation, where the TMC commands and
controls the sign and determines the appropriate message or test pattern; and (2) local
operation, where the sign controller or a laptop computer commands and controls the sign
and determines the appropriate message or test pattern.
Keep electronic components away from the access door to protect
them from the elements. Ensure that the walk-in housing containing the local control
panel has switches that perform the following functions:
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1. Control Selection – Ensure that the local/remote switch
on the local control panel works in parallel with the local/remote switch located in the
ground control box. Provide a LED indicator near the local/remote switch to indicate
when either switch has selected the local mode. The operating mode is determined by the
position of the mode switch on the local control panel. If the local control panel’s switch
is set to local, the operating mode is local. Otherwise, the operating mode is master.
2. Message Selection – Ensure that the sign controller’s
keypad may be used to select a blank message or any one of the messages stored in the
sign controller’s nonvolatile memory when the control mode is set to local.
3. Message Implementation – Ensure that the sign
controller can activate the selected message.
Ensure that the sign controller transmits a return message to the
TMC whenever it receives a valid status request. Ensure that return messages contain an
Internet Protocol (IP) address for the sign controller, the actual message that is visibly
displayed on the sign, the displayed message’s transmission origin (i.e., the TMC, laptop
computer, manual entry, etc.), remote or local control status, error and failure reports,
temperature readings, access alarms, power supply voltage levels, line voltage, and UPS
status.
In the event of a sign controller failure, ensure that the sign
controller blanks any message displayed. Ensure that the sign can be programmed to
display a user-defined message, including a blank page, in the event of power loss.
Ensure that message additions, deletions, and sign controller
changes may be made from either the remote TMC or a local laptop computer. Ensure
that each font may be customized, and modifications to a font may be downloaded to the
sign controller from the TMC or a laptop computer at any time without any software or
hardware modifications. Ensure the sign is capable of displaying a different font and
character spacing on each line.
Ensure that messages can be activated with a run-time duration
specified. Ensure that the sign can be programmed to display a user-defined message,
including a blank page, once the run-time duration of another message has expired.
Ensure that there is no perceivable flicker or ghosting of the pixels during sign erasure
and writing periods.
Ensure that in the event of an AC power loss all nonvolatile
memory is retained for a minimum of 30 calendar days. Ensure that the sign controller
monitors the messages downloaded from the TMC or laptop computer to make sure that
the message will fit in the display area of the sign. Ensure that the sign controller’s
internal time clock provides for message deactivation at the correct time, even in the
event of a communication loss. Ensure that the sign controller maintains its internal clock
during power outages and automatically displays the proper message when power is
restored within 255 minutes. Ensure that the sign can also be programmed to
automatically blank the display following a power outage longer than 255 minutes.
781-3.2 Dynamic Message Sign with 12-inch High Character Display (12Inch
DMS): Furnish and install a 12 inch DMS in accordance with the details specified in the
Contract Documents. Use only equipment and components that meet the requirements of
these minimum specifications, and are listed on the Department’s Approved Product List
(APL).
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781-3.2.1 General: Ensure that all exposed material is corrosion resistant.
Ensure that the electronic equipment associated with the sign remains secure from
damage and protected from moisture, dust, dirt, and corrosion.
Ensure that ambient magnetic or electromagnetic fields, including
those created by any system components, have no negative effects on system
performance. Ensure that the system does not conduct or radiate signals that interfere
with other electrical or electronic equipment including, but not limited to, other control
systems and data processing, audio, radio, and industrial equipment.
Ensure that the sign housing complies with the fatigue resistance
requirements of the fifth edition AASHTO Standard Specifications for Structural
Supports for Highway Signs, Luminaires, and Traffic Signals with current addendums.
Design and construct the sign for continuous usage of at least 20 years and the sign
structure for a 50-year design life. Ensure that equipment and structures are designed to
withstand the wind loads defined in the FDOT Structures Manual without deformation or
damage.
Ensure that the sign is fabricated, welded, and inspected in
accordance with the requirements of the current ANSI/AWS Structural Welding CodeAluminum. Ensure that all identification markings on the sign and its components,
including but not limited to panels, terminal blocks, and printed circuit boards, are silkscreened and sealed or otherwise indelible. Ensure that the equipment design allows
access and maintenance without special tools. Ensure that all component parts are
accessible and available for inspection and maintenance for the duration of the system
design life. Provide labeled test points for checking essential voltages. Ensure that all
external connections are terminated using connectors. Key the connectors to preclude
improper hookups. Provide a clear removable cover measuring a minimum of 0.125 inch
thick to cover all exposed power terminals. Ensure that the covers do not interfere with
sign functions or maintenance operations.
781-3.2.2 Sign Housing: Ensure that the non-display external skin of the
sign housing is constructed of aluminum alloy 5052 H32 that is a minimum of 0.090 inch
thick. Ensure that the sign housing design and appearance is approved by the Engineer. If
cable attachments are used in the sign housing, the cables shall be securely clamped using
a method approved by the Engineer.
Ensure housing exterior is attached to the structural framework
using a method approved by the Engineer. Ensure the housing bevel of the housing face
is not greater than 1 foot on any side. Ensure housing provides an environmental seal for
internal components with a minimum rating of IP54. Ensure all openings in housing
(such as vents and drain holes) are safeguarded against the entrance of insects and
animals.
Ensure LED display module(s) are mounted such that the legible
viewing area is optimized.
Ensure all assembly hardware, including nuts, bolts, external
screws and locking washers less than 5/8 inch in diameter, are Type 304 or 316
passivated stainless steel and meet the requirements of ASTM F 593 and ASTM F 594.
All assembly hardware greater than or equal to 5/8 inch in diameter must be galvanized
and meet the requirements of ASTM A 325.
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Ensure housing includes a method of hoisting to allow for proper
mounting of device via use of standard construction equipment. Ensure the sign remains
level when hoisted. Ensure hoisting design prevents damage when device is shipped,
handled, and installed.
781-3.2.2.1 Interior Structure: Ensure that framing structural
members are constructed of aluminum alloy (6061 T6 or 6063 T5) a minimum of
0.1875 inch thick.
781-3.2.2.2 Housing Face: Ensure that housing face consists of
internal structural members, external fascia panels, and lens panel assemblies. Ensure that
the exposed fasteners on the housing face are the same color and finish as the housing
face. Use only captive fasteners on the housing face.
781-3.2.2.2.1 Internal Structural Members: Ensure that
internal structural members are constructed of extruded aluminum. Ensure that the
internal structural members retain the display modules in a manner that facilitates the
easy and rapid removal of each display module without disturbing adjacent display
modules.
781-3.2.2.2.2 External Fascia Panels: Ensure that external
fascia panels are constructed using aluminum. Ensure fascia panels are sealed to prevent
intrusion of water, moisture, dust, dirt, and other contaminants into the sign interior.
Finish each fascia panel with a matte black coating system that meets or exceeds
American Architectural Manufacturers Association (AAMA) Specification No. 2605.
781-3.2.2.2.3 Lens Panel Assembly: Provide lens panel
assemblies that are modular in design, removable, and interchangeable without
misalignment of the lens panel and the LED pixels. Ensure that lens panels include a
mask constructed of 0.080 inch minimum thickness aluminum with a matte black coating
that meets or exceeds AAMA Specification No. 2605 with a minimum thickness of 0.04
inch. Ensure that the mask is perforated to provide an aperture for each pixel on the
display module. Ensure that the apertures are uniform, centered over each pixel, and as
small as possible without blocking the LED output at the required viewing angle.
Ensure the lens panel assembly consists of LEDs,
other internal electronics, an aluminum mask, and an environmental shielding layer
coating to protect and seal the LEDs and other internal electronics. The coating shall be a
minimum 90% ultraviolet (UV) opaque.
781-3.2.2.3 Sign Housing Surface Finish: Ensure that all sign
face surfaces are finished with a matte black FP-based coating system that meets or
exceeds AAMA Specification No. 2605. Provide certification that the sign face parts are
coated with the prescribed thickness. Ensure all other exterior and all interior housing
surfaces are a natural aluminum mill finish. No interior painted surfaces are allowed.
781-3.2.2.4 Sign Housing Access: Provide unobstructed front or
rear access that allows servicing of internal components. Ensure access does not require
specialized tools or excessive force.
781-3.2.2.5 Sign Housing Ventilation System: If a ventilation
system is required, ensure that it distributes air over all LEDs, power supplies, and
communication devices inside the sign housing. Ensure that air circulation is evenly
distributed within the housing. Submit ventilation system design calculations to the
Engineer for approval.
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Ensure that air drawn into the sign is filtered upon entry.
Ensure that filters remove airborne particles measuring 500 microns in diameter and
larger.
Ensure that the ventilation system is automatically tested
once each day, and that it may be tested on command from remote and local control
access locations. Ensure that the sign controller will send an error message to the
designated monitoring personnel when a failure occurs. Ensure that the sign is capable of
operating without any decrease in performance over an ambient operating temperature
range of -29° to 165°F as per NEMA TS 4, Subsection 2.1.5.1, with a maximum relative
humidity of 100%.
Ensure that any ventilation system has a fail-safe that
includes a snap disk thermostat that is independent of the sign controller. Preset the
thermostat at 130°F. If the sign housing’s interior reaches 130°F, the thermostat will
override the normal ventilation system, bypassing the sign controller and turning on all
sign ventilation fans. The fans will remain under the control of the thermostat until the
internal sign housing temperature falls to 115°F, at which time the fail-safe subsystem
will return control of the ventilation system to the sign controller. Ensure that any
ventilation system fans possess a 100,000-hour L10 life rating.
781-3.2.2.6 Sign Housing Temperature Sensor: Ensure that the
sign controller continuously measures and monitors the temperature sensors. Ensure that
the sign can be programmed to blank when a user-defined critical temperature is
exceeded. Ensure that the sign will report such events when polled. Ensure that the userselectable, critical temperature may be changed by remote and local control access.
Ensure that remote and local computers can read all temperature measurements from the
sign controller. When the sign reaches a temperature that is 2°F lower than the critical
high temperature, ensure that the sign controller will decrease the LED intensity to half
its normal brightness.
781-3.2.2.7 Sign Housing Humidity Sensor: Ensure the sign
includes a humidity sensor that detects from 0 to 100% relative humidity in 1% or
smaller increments. Ensure that the sensor will operate and survive in 0 to 100% relative
humidity, and has an accuracy that is better than ±5% relative humidity. A humidistat is
not acceptable.
781-3.2.2.8 Photoelectric Sensor Devices: Ensure the sign
electronics monitor ambient light using a minimum of three photocells. Ensure that the
photocells are placed so they measure light levels on the front and rear of the sign, and
ambient light conditions at the sign location. Ensure that the devices provide accurate
ambient light condition information to the sign controller for automatic light intensity
adjustment. Ensure that the automatic adjustment of the LED driving waveform duty
cycle occurs in small enough increments that the sign’s brightness changes smoothly,
with no perceivable brightness change between adjacent levels. Ensure that stray
headlights shining on the photoelectric sensor at night do not cause LED brightness
changes.
Supply the sign with a brightness-versus-ambient light
matrix table with algorithms and/or other means of calculation that enables the sign to
automatically adjust LED output according to ambient light level. Ensure the sign
controller monitors the photocell circuits in the sign and correlates the readings with the
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brightness table to convert the measured light intensity into the desired pixel brightness.
Ensure that the brightness table in each individual sign controller is adjustable from
remote or local control access, and can be customized according to each installation site’s
requirements. Ensure that the sign controller automatically controls the pixel brightness
to compensate for differences in ambient light levels, such as the differences in day and
night. In addition to the automatic mode, ensure that the brightness may be set from 1%
to 99% in 1% increments manually from the front panel of the sign controller and
remotely from the TMC.
Ensure that the brightness and color of each pixel is
uniform over the sign’s entire face within a 30 degree viewing angle from 100 to 600 feet
in all lighting conditions. Non-uniformity of brightness or color over the sign’s face shall
be cause for rejection of the sign.
781-3.2.3 Display Modules: Provide display modules manufactured by
one source and fully interchangeable throughout the manufacturer’s sign system(s).
Ensure that removal of a single display module does not impact the operation of other
display modules. Ensure that removal or replacement of a complete display module or
LED board can be accomplished without the use of any tools.
Ensure display modules contain solid-state electronics needed to
control pixel data and read pixel status.
781-3.2.3.1 Module Arrangement and Character Size:
Assemble display modules to form a full matrix display as shown in the plans. Ensure
that the display is capable of providing a minimum character height of 12-inches when
using 5-pixel by 7-pixel characters.
781-3.2.3.2 LED and Pixel Specifications: Ensure that the 12”
DMS utilizes amber LED lamps with a minimum viewing angle of 30 degrees and a peak
wavelength of 590 nanometers. Ensure that the LED peak wavelength output varies no
more than ±2 nanometers. Ensure that the LED pixel cone of vision is a minimum of
30 degrees (centered on the optical axis, or zero point, of the pixel). The cone perimeter
is defined by the point where light output intensity is 50% of the intensity measured at the
zero point of the pixel.
Ensure that each pixel has a minimum diameter of
0.5 inches, and that the LEDs in each pixel are clustered to maximize long-range
visibility. Ensure that all pixels in all signs in a project, including operational support
supplies, have equal color and on-axis intensity. Ensure that the sign display produces an
overall luminous intensity of at least 9200 candelas per square meter when operating at
100% intensity. Measure the brightness of each LED in accordance with the International
Commission on Illumination’s (CIE) requirements as detailed in Test Method A of the
CIE 127 (1997) standard. Provide the LED brightness and color bins that are used in each
pixel to the Engineer for approval. Provide a letter of certification from the LED
manufacturer that demonstrates testing and binning according to the CIE 127 (1997)
standard.
Ensure each pixel contains two interlaced strings of LEDs.
Ensure that all LEDs operate within the LED manufacturer’s recommendations for
typical forward voltage, peak pulsed forward current, and other ratings. Component
ratings shall not be exceeded under any operating condition. Ensure that LED failure in
one string within a pixel does not affect the operation of any other string or pixel.
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Provide a pixel test as a form of status feedback to the
TMC from the local sign controller. Ensure that the operational status of each pixel in the
sign can be automatically tested once a day. Ensure the operational status may also be
tested when the TMC or a laptop computer prompts a pixel test either remotely or on-site.
Ensure that a log file can be created containing a list of defective pixels as transmitted to
the TMC or a laptop computer. Ensure that the log file includes the pixel status, module
number, column number, and pixel number. Ensure that the pixel status test determines
the functional status of the pixel as stuck-on or stuck-off and does not affect the displayed
message for more than half a second.
Ensure that LEDs are individually mounted directly on a
PCB, and are individually removable and replaceable using conventional electronic repair
methods.
781-3.2.3.3 Optical, Electrical, and Mechanical Specifications
for Display Modules: Ensure that each display module contains connectors for power,
controls, and data; contains display module control electronics and memory elements;
and provides the signals to switch the LED pixels.
Ensure the display modules are rectangular and have an
identical vertical and horizontal center-to-center distance (i.e., pitch) between adjacent
pixels ranging from 1.71 inches to 1.82 inches. Ensure that the separation between the
last column of one display module and the first column of the next module is equal to the
horizontal distance between the columns of a single display module.
Ensure that the LED circuit board is a NEMA FR4-rated,
single 0.062-inch, black PCB. Ensure that alternate LED board configurations are
submitted to and pre-approved by the Engineer prior to installation. Ensure that PCBs
enable components to be removed and replaced without damage to boards, traces, or
tracks. Ensure that the intercomponent wiring is a copper-clad track having a minimum
weight of 2 ounces per square foot with an adequate cross section for carrying circuit
current. Ensure that no PCB has more than two PCB jumper wires present. Finish all
PCBs with a solder mask and a component identifying silk screen.
Provide all PCBs, except for the LED motherboard and
power supply PCBs, with a complete and conformal coating of silicone or acrylic resin
with a minimum thickness of 0.01 inch. Provide the LED motherboards with a complete
conformal coating of silicone or acrylic resin with a minimum thickness of 0.01 inch,
except for the pixels on the front of the PCB. Meet the material requirements of MIL-I46058C Military Standard, United States Department of Defense (USDOD).
Mount all LEDs so that the mechanical axis of the LED is
±1 degree to the sign’s face to ensure uniformity of brightness over the sign’s face.
Ensure that LEDs are secured perpendicular to the display module within 0.5 degree.
Ensure that any devices used to secure LEDs do not block air flow to the LED leads or
block the LED light output at the required viewing angle. Ensure that all components on
the LED side of PCBs are black.
Ensure that the voltage to the LED modules and their
associated electronics does not exceed 25 VDC. Ensure that there are a minimum of two,
and a maximum of four, power supplies that are wired in a parallel configuration for
redundancy. Ensure that multiple power supplies are used to provide power to each
display module. Ensure the voltage measured at the display modules does not vary more
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than 50 millivolts over all the display modules in the sign with 17 pixels on at 100%
intensity in each display module. Ensure that if one supply completely fails, the sign shall
still be supplied with enough power to run 40% of all pixels at a 100% duty cycle with an
ambient operating temperature of 165° F. Ensure that the supplies have a current sharing
capability that allows them to provide equal amounts of current to their portion of the
LED display.
Ensure that the sign controller continuously measures and
monitors all LED module power supply voltages and provides the voltage readings to the
TMC or a laptop computer on command. Ensure that an error message will be sent to the
TMC or a laptop computer when it polls the sign controller if voltages measured are
outside nominal values.
Ensure that LEDs are protected from external
environmental conditions, including moisture, snow, ice, wind, dust, dirt, and UV rays.
Do not use hoods, louvers, cylinders or visors that could impede the free flow of air over
any surface of each individual LED. Do not use epoxy to encapsulate the LEDs.
781-3.2.4 Character Displays: Ensure that the signs are capable of
displaying American Standard Code for Information Interchange (ASCII) characters 32
through 126, including all uppercase and lowercase letters and digits 0 through 9, at any
location in the message line.
Ensure that the uppercase alphanumeric characters are displayed
over the complete height of the matrix. Submit a list of the character fonts to the Engineer
for approval.
Characters must be legible under all light conditions at a distance
ranging from 100 to 600 feet within the 30 degree cone of vision centered on the pixel’s
optical axis. Ensure that the operator is able to display compressed, expanded, or doublestroke character fonts, and to change the default spacing between characters. Ensure that
the spacing options include 1-, 2-, or 3-pixel columns between the characters. Ensure the
system is loaded with a default font in accordance with the Standard Font set described in
NEMA TS4-2005 (section 5.6). Ensure the system allows the assignment of font access
privileges. Ensure that the sign controller is capable of a self-updating time and/or date
display on the sign.
781-3.2.5 Main Power Supply and Energy Distribution Specifications:
Provide a nominal single-phase power line voltage of 120/240 VAC protected by a twopole (i.e., common trip) main circuit breaker sized as required for the sign and its
controller. Ensure that the system operates within a voltage range of 97 to 135 VAC as
specified in NEMA TS 4, Subsection 2.1.3.1.
Ensure that all power inside the sign housing is supplied by
120 VAC independently protected by a thermomagnetic circuit breaker at the sign’s
service entry point. Locate all 120 VAC wiring in conduit, pull boxes, raceways, or control
cabinets as required by the NEC. Ensure that no 120 VAC wiring is exposed inside or
outside of the sign housing. Do not use the sign housing as a wiring raceway or control
cabinet.
Ensure that the sign and its controller have an operating frequency
of 60 hertz (Hz), plus or minus 3.0Hz, as stated in NEMA TS 4, Subsection 2.1.3.2.
Ensure that the drop in the unit’s voltage between no-load and full-load during normal
operations does not exceed 10% of the nominal voltage. Provide power protection
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through the use of a thermomagnetic circuit breaker connected to a 5-milliampere GFI
device that protects all service outlets. Provide a 100-amp 120/240 VAC two-pole load
center with a 20-circuit capability. Provide separate circuit breakers for each sign circuit.
Provide Type XHHW power cables sized as required by the NEC
for acceptable voltage drops while supplying alternating current to the sign. Ensure that
the sign power consumption does not exceed 3,000 VA under any circumstance,
including operation of fans and heaters (if provided within the sign), sign controllers and
communication equipment, and all pixels illuminated at 100% brightness.
Provide protection devices such as surge protective devices and
lightning arrestors installed or incorporated in the sign system by the manufacturer to
guard against lightning, transient voltage surges, and induced current. Ensure that the
protection devices meet or exceed the device protection requirements as contained in
Section 785-2. Use protection devices on all electric power and data communication
connections.
Ensure that the DC and AC voltage ratings and dissipation factors
of capacitors used in the sign system exceed the worst-case design parameters of the
circuitry by 50%. Ensure that capacitors that are not surface mount components are
mechanically supported by a clamp or fastener that is resistant to cracking, peeling, and
discoloration.
Ensure that resistors used in the sign are within 5% of the tolerance
of the specified temperature range and, when operated in excess of 50% of its power
rating, have an adequate heat sink.
Ensure all transistors, integrated circuits, and diodes are a standard
type, listed by the EIA, and clearly identifiable.
781-3.2.6 Uninterruptible Power Supply: Provide each sign with an
uninterruptible power supply (UPS) capable of maintaining and continuing the operation
of the sign and its related communication device for a minimum of two hours. Provide
sealed AGM type batteries that are maintenance free.
781-3.2.7 Operational Support Supplies: Furnish the operational support
supplies listed in the table below. Promptly replace any of the supplies used to perform a
warranty repair.
For every group of 10 or fewer 12inch DMS signs provided or
required, provide 1 set of supplies as follows:
1 each
5 each
1 each
1 each
1 each
1 each
2 each
1 each
1 each
10 each
2 each
Sign Controller
LED Display Modules
Uninterruptible Power Supplies
System Interface Circuit
Cable for connecting interface circuits to daughter boards (if
applicable)
Display Module Cables
Surge Suppression Sets
Fan Assembly
Time Relay for Fan Control
Every Small Fuse (≤ 10 amp)
Every Large Fuse (> 10 amp)
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1 each
Sensor for each type of sensor
The Engineer will review and approve the operational support
supplies.
781-3.2.8 Sign Controller: Ensure that the sign is provided with a sign
controller that includes operational firmware stored in nonvolatile memory. Program the
controller to receive sign control commands, transmit responses (as requested), and to
control sign operation and message displays both remotely and on site to and from
designated users. Ensure that sign controller functions include error logging and
reporting, and providing the operational status of the sensors including temperature,
photocell, airflow, and humidity and LED power supply sensors.
Ensure that the sign controller will read the internal temperature
sensors, the external ambient temperature sensors, and the humidity sensors and use the
readings in an algorithm that turns on heat tape and/or fans when conditions warrant
preventing frost on the face of the sign and condensation on the display modules and
other electronic circuitry.
Ensure that the sign controller receives and sends messages by way
of an Ethernet network and that the failure of any sign does not affect the operation of
any other sign in the system.
Ensure that, at a minimum, the sign controller provides for local
control and programming of the sign, including power on/off, communications, and sign
diagnostics and error status.
Ensure that the controller provides power-up and automatic restart
capabilities with automatic sign blanking when recovering from a power-off condition.
Ensure that the sign can be configured to either display a stored message or blank upon
recovery from power loss and upon recovery from system resets. Utilize a hardware
watchdog circuit to provide automatic recovery from critical errors and automatic
shutdown in the event of critical hardware failure.
Ensure that there is a ground level access point at the location
shown in the plans and an access point within the sign that allows the sign to be
programmed and controlled locally using a laptop computer.
781-3.2.9 Display System Hardware: Ensure the sign utilizes a system
data interface circuit for communication between the sign controller and display modules.
Ensure that the following components reside inside the sign housing: sign controller,
display system interface circuits, display modules, power supplies, local and remote
control switches, LED indicators, Electronic Industries Alliance (EIA)-232 null modem
cables (minimum of 4 feet long for connecting laptop computer to sign controller), and
surge protective devices.
781-3.2.10 Control Cabinet: Provide a control cabinet that meets the
requirements of Section 785-4. Ensure that the minimum height of the cabinet is
46 inches.
Equip the ground control cabinet with the assemblies and
components, as shown in the plans: power indicator, surge suppression on both sides of
all electronics, communication interface devices, connection for a laptop computer for
local control and programming, cables a minimum of 4 feet long to connect laptop
computers, a UPS system, a workspace for a laptop computer, and duplex outlets.
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Provide for all telephone, data, control, power, and confirmation
connections between the sign and ground control box, and for any required wiring
harnesses and connectors.
781-3.2.11 Sign Controller Communication Interface: Ensure that the
sign controller includes two separate EIA-232 serial interfaces inside the sign housing for
communication with the TMC or a laptop computer, and one Ethernet 10/100 Base TX
8P8C port. Ensure that EIA-232 serial interfaces support the following:
Data Bits: 7 or 8 bits
Parity: Even, Odd, or None
Number Stop Bits: 1 or 2 bit
Ensure that all Category 5 unshielded twisted pair/shielded twisted pair network cables
are compliant with the EIA/TIA-568-A standard.
Configure one EIA-232 serial interface to drive asynchronous modems for
full duplex communication with the TMC over point-to-point dial-up lines or a multidrop
fiber or copper network. Ensure that switching between dial-up, Ethernet, and multidrop
operation does not require sign controller software or hardware modifications.
For dial-up operations, acquire and bear the charges of installing and
connecting the dial-up telephone line. Provide modems to be retained by the Department
at each location. Provide user selectable data transmission rates of up to 56 kbps for dialup operations.
Configure the second EIA-232 serial port for local communication with a
laptop computer.
Ensure that the sign controller can be managed remotely from a TMC or
locally using a laptop computer. Ensure that the TMC or a laptop computer can be used
to remotely reset the sign controller.
Ensure that the sign controller and its software will display single-page
and multi-page messages with mixed fonts and spacing. Ensure that message page times
and text flashing rates are programmable between 0.5 and 5 seconds in 0.1-second
increments.
Ensure that the sign system will log and report errors and failures,
including data transmission errors, receipt of invalid data, communication failure
recoveries, alternating current power failures, power recoveries, pixel status reads, fan
and filter airflow status, temperature status, power supply status, and information on the
operational status of the temperature, photocell, airflow, humidity, and LED power
supply sensors. Ensure that airflow and humidity sensor information is reported using the
objects from the dmsClimateCtrlStatusTable of the NTCIP 1203 V2 standard.
781-3.2.12 Message and Status Monitoring: Ensure that the 12” DMS
provides two modes of operation: (1) master operation, where the TMC commands and
controls the sign and determines the appropriate message or test pattern; and (2) local
operation, where the sign controller or a laptop computer commands and controls the sign
and determines the appropriate message or test pattern.
Ensure that the sign can perform the following functions:
1. Control Selection – Ensure that local or remote sign
control can be selected. Ensure that there is a visual indicator on the controller that
identifies whether the sign is under local or remote control. Ensure that the sign responds
to remote control by default. If the sign includes a physical local/remote mode switch,
the operating mode must be determined by the position of the mode switch on the local
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control panel. If the local control panel’s switch is set to local, the operating mode is
local. Otherwise, the operating mode is master.
2. Message Selection – Ensure that the sign controller can
select a blank message or any one of the messages stored in the sign controller’s
nonvolatile memory when the control mode is set to local.
3. Message Implementation – Ensure that the sign
controller can activate the selected message.
Ensure that the sign controller transmits a return message to the
TMC whenever it receives a valid status request. Ensure that return messages contain an
Internet Protocol (IP) address for the sign controller, the actual message that is visibly
displayed on the sign, the displayed message’s transmission origin (i.e., the TMC, laptop
computer, manual entry, etc.), remote or local control status, error and failure reports,
temperature readings, access alarms, power supply voltage levels, line voltage, and UPS
status.
In the event of a sign controller failure, ensure that the sign
controller blanks any message displayed. Ensure that the sign can be programmed to
display a user-defined message, including a blank page, in the event of power loss.
Ensure that message additions, deletions, and sign controller
changes may be made from either the remote TMC or a local laptop computer. Ensure
that each font may be customized, and modifications to a font may be downloaded to the
sign controller from the TMC or a laptop computer at any time without any software or
hardware modifications. Ensure the sign is capable of displaying a different font and
character spacing on each line.
Ensure that messages can be activated with a run-time duration
specified. Ensure that the sign can be programmed to display a user-defined message,
including a blank page, once the run-time duration of another message has expired.
Ensure that there is no perceivable flicker or ghosting of the pixels during sign erasure
and writing periods.
Ensure that in the event of an AC power loss all nonvolatile
memory is retained for a minimum of 30 calendar days. Ensure that the sign controller
monitors the messages downloaded from the TMC or laptop computer to make sure that
the message will fit in the display area of the sign. Ensure that the sign controller’s
internal time clock provides for message deactivation at the correct time, even in the
event of a communication loss. Ensure that the sign controller maintains its internal clock
during power outages and automatically displays the proper message when power is
restored within 255 minutes. Ensure that the sign can also be programmed to
automatically blank the display following a power outage longer than 255 minutes.
781-3.3 TMC Communication Specifications for all DMS: Ensure that
the sign controller is addressable by the TMC through the Ethernet communication
network using software that complies with the NTCIP 1101 base standard (formerly the
NEMA TS 3.2 -1996 standard), including all amendments as published at the time of
contract letting, and the NTCIP Simple Transportation Management Framework, and
conforms to Compliance Level 1. Ensure that the software implements all mandatory
objects as defined in the FDOT standard Global MIB in Appendix A, all mandatory
objects as defined in the FDOT-standard DMS MIB in Appendix B, and all mandatory
objects as defined in the FDOT-specific DMS MIB in Appendix C as published on the
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FDOT State Traffic Engineering and Operations Office web site at the time of contract
letting. Ensure that the sign complies with the NTCIP 1201 v01, 1203 v01, 2101 v01.19,
2103 v01.13, 2201 v01.14, 2202 v01.05, and 2301 v01.08 standards. Ensure that
compliance with FDOT MIB requirements takes precedence within NTCIP
implementations. Ensure that any additional objects implemented by the software do not
interfere with the standard operation of any mandatory objects.
Ensure that each sign provides full, standardized range support for
all objects required by these specifications unless otherwise detailed in the plans. The
standardized range is defined by a size, range or enumerated listing indicated in the
object’s syntax field and/or through descriptive text in the relevant standard object
description field. Ensure that the sign maximum response time does not exceed
100 milliseconds plus one millisecond for each byte in the response variable-bindings
field. Deviances from the full ranges for objects are detailed in Table 1.
Table 1 – Range Deviances for Objects
Object
Minimum Requirements
FDOT Global MIB v01c
Maximum Event Log Configurations
50
Event Configuration Mode
2, 3, and 4
Maximum Event Log Size
200
Maximum Event Classes
7
Maximum Group Address
1
FDOT DMS MIB v01c
Number of Fonts
4
Maximum Font Characters
255
Default Background Color
0
Default Foreground Color
9
Default Justification Line
2, 3, 4
Default Justification Page
2, 3, 4
DMS – Number of Permanent Messages
0
DMS – Maximum Changeable Messages
50
DMS – Maximum Volatile Messages
0
Nonvolatile Memory
5 KB
DMS – Control Mode
2, 3, 4, and 5
Number of Action Table Entries
15
Number of Brightness Levels
16
Ensure that the software implements the tags (opening and closing
where defined) of MULTI as detailed in Table 2 and as defined in the NTCIP 1203
standard.
Opening
Tag
Cbx
Cfx
Table 2 – NTCIP 1203 Standard Software Tags *
Closing
Explanation
Tag
Color – Background – The background color for a message.
Color – Foreground – The foreground color for a message.
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Table 2 – NTCIP 1203 Standard Software Tags *
Opening
Closing
Explanation
Tag
Tag
Field – The information to embed within a message that is based
on data from some device, such as a clock, calendar, temperature
sensor, detector, etc.
The following field tag values (IDs) are REQUIRED to be
supported:
1 – the time in a 12-hour format;
fx,y
2 – the time in a 24-hour format;
4 – the ambient temperature in degrees Fahrenheit;
7 – the day of the week;
8 – the date of the month;
9 – the month of the year;
10 – the year in two digits; and
11 – the year in four digits.
Flash – Activate flashing of the text; define the flash-on and
Fltxoy
/fl
flash-off times; and the flash order (i.e., on/off or off/on).
Font – Select a font number (as specified in the font table) for the
Fox
message display.
Justification – Line – Specify line justification: left, center, right,
Jlx
or full. However, full justification is not required.
Justification – Page –Specify page justification: top, middle, or
Jpx
bottom.
Moving – Text – Specify the parameters of a horizontal moving
mvtdw,s,r,text
(scrolling) text.
Nlx
New – Line – Specify the start of a new line.
Np
New – Page – Specify the start of a new page.
Ptxoy
Page – Time – Specify the page times (t = on, o = off).
Scx
/sc Spacing – Character – Specify the spacing between characters.
* The letters “x” and “y” are character placeholders, usually for numbers, that specify the tag parameter(s). See the
NTCIP 1203 standard and its amendments for further definitions.
Ensure that the controller’s internal time clock can be configured
to synchronize to a time server using the Network Time Protocol (NTP). NTP
synchronization frequency must be user configurable and permit polling intervals from
once per minute to once per week in 1-minute increments. The controller must allow the
user to define the NTP server by Domain Name System (DNS) and IP address. Provide
each sign controller with error detection and reporting features that will be used to guard
against incomplete or inaccurate transmissions including cyclic redundancy checking of
all data received from the TMC, with positive acknowledgment for all valid
transmissions; status monitoring for communication line malfunctions or breakages; and
content validation for all transmissions received for logic or data errors.
Provide communication line circuits that are point-to-point or
multipoint, and that provide full duplex asynchronous data transmissions at the rate
shown in the contract documents or directed by the Engineer.
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Assign each sign controller a unique address. Where applicable,
encode all data transmitted between the TMC and the sign controller using 1 start bit,
8 data bits, and 1 stop bit.
781-3.4 Electronic Components: Ensure that all electronic components, with the
exception of PCBs, are commercially available, easily accessible and replaceable, and
individually removable using conventional electronic repair methods.
Ensure that all workmanship complies with the ANSI International
Policy Committee (IPC) requirements as defined in the ANSI/IPC-A-610B,
ANSI/IPC-7711, and ANSI/IPC-7721 Standards.
781-3.5 Mechanical Components: Ensure that the sign is fabricated using only
stainless steel external screws, nuts, and locking washers. Do not use self-tapping screws
unless specifically approved by the Engineer. Ensure that all parts are fabricated from
corrosion-resistant materials, such as plastic, stainless steel, aluminum, or brass. Ensure
that construction materials are resistant to fungus growth and moisture deterioration.
Ensure that all dissimilar metals are separated with an inert, dielectric material.
781-3.6 Sign Control Software: Ensure that the sign is provided with computer
software from its manufacturer that allows an operator to program, operate, exercise,
diagnose, and read current status of all sign features and functions using a laptop
computer. Ensure that sign control software provides a graphical representation that
visibly depicts the sign face and the current ON/OFF state of all pixels as well as allows
messages to be created and displayed on the sign. Ensure that the laptop computer and
sign can communicate when connected directly by an EIA-232 cable and via Ethernet.
Ensure that the laptop computer and sign can communicate across the ITS system’s
communication network using the NTCIP standards described in this document. Ensure
that the software will allow communication between multiple users and multiple signs
across the same communication network.
781-3.7 Sign Support Structure: Meet the requirements of 700-2.4.
781-3.8 Installation Requirements: Do not install the sign prior to the
availability of electric power. Verify that any ventilation system incorporated within the
sign is operational within 72 hours after sign installation.
Set the sign housing’s vertical angular alignment as shown in the plans.
Ensure that lifting eyebolts are removed and any remaining holes in the top surface of the
sign are sealed to prevent water entry after installation.
Load the initial message libraries on both the sign control software and the
sign controller. The Engineer will furnish the messages to be placed in these libraries.
781-3.9 Documentation: Provide documentation as noted below, reflecting the
as-built conditions necessary to facilitate the operation, maintenance, modification, and
expansion of the DMS system or any of its individual components. Manufacturersupplied documentation that covers the intent of these specifications may be used, subject
to the approval of the Engineer.
Provide the Engineer with two paper copies and one electronic copy of all
documentation. Print the paper copies on 8 1/2-by-11-inch paper and place in three-ring
binders. Format the electronic copy in portable document format and submit on CDROM. Ensure that electronic submittals are compatible with the Department’s own
software and CADD programs at the time submittals are made. In addition, place one
paper copy of an operations and maintenance manual and as-built drawings, wiring
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diagrams, and schematics at each DMS location. Ensure that the drawings are printed on
11-by-17-inch sheets and include structural member and attachment support details.
Provide each of the following items in the operations and maintenance manual:
1. A general description of the equipment’s basic use and function.
Provide a general block diagram of the DMS equipment, including the nomenclature,
physical and electrical characteristics, and the functions of any auxiliary devices utilized.
2. Sections describing the DMS using block diagrams and
schematic drawings. Furnish layout drawings showing the location of all components,
along with a complete components list. Use a logical development starting with a system
block level and proceeding to a circuit analysis. Detail the circuit analysis whenever
circuits are not normally found in standard textbooks. Fully describe the application of
new theoretical concepts. Where the design allows operation in a number of different
modes, provide an operational description of each mode.
3. The standard routine of operation for the DMS, from necessary
preparations for placing the equipment into operation to securing the equipment after the
beginning of operation. Include appropriate illustrations with the sequence of operations
presented in tabular form wherever feasible. Provide a list of applicable test instruments,
aids, and tools required in the performance of necessary measurements and techniques for
each system component. Describe setup tests and calibration procedures.
4. Information required to maintain, diagnose, and repair the sign
and its controller to the component level, including the manufacturer’s recommended
procedures for preventive maintenance performed weekly, monthly, quarterly, semiannually, and annually, and any other required maintenance checks necessary to assure
reliable equipment operation. Fully describe all adjustments and alignment procedures
and provide descriptions of expected signals at all test points and outputs. List all
requirements, including tolerances for all electrical, mechanical, and other applicable
measurements and adjustments. Provide a repair and troubleshooting decision tree that
describes each function, the tests of each function, and any process that defines faulty
elements that require repair, replacement, or adjustment to restore operation of a
malfunctioning sign or system element.
5. General instructions for the disassembly, overhaul, and
reassembly of the DMS, including shop specifications and operating performance
specifications.
6. Detailed instructions and specifications for maintenance that
must be accomplished by specialized technicians and engineers in a modern
electromechanical shop. Include instructions that describe special test setups, component
fabrications, and the use of special tools, jigs, and test equipment.
7. A detailed physical description of size, weight, special mounting
requirements, electrical connections, and all other pertinent information necessary for
proper installation and use of the equipment.
8. A parts list containing all equipment within a group, and a list of
all assemblies, subassemblies, and unit replacement parts. Arrange the list in
alphanumerical order of the schematic reference symbols and shall give the associated
description, manufacturer’s name, and part number. Provide a table of contents or some
other appropriate grouping method for the purpose of identifying major components,
assemblies, etc.
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9. Complete and accurate schematic diagrams as required to
supplement the text material and to allow the books to be self-contained technical
information sources. Include part reference symbols, test voltages, waveforms, and other
aids to understanding the circuit’s functions on the diagrams.
Include drawings of conduit layouts, cable diagrams, wiring lists, control
cabinet layouts, wiring diagrams, and schematics for all elements of the communication
system in the final documentation. Include detailed drawings identifying the routing of all
conductor pairs in the communication system by cable type, color code, and function.
Upon completion of the installation, submit these plans, maps, drawings, and/or diagrams
to reflect an as-built condition, incorporating all changes made during installation, such
as in-pair identification and routing.
Provide software and documentation for the TMC software system and its
components including, but not limited to all documentation concerning the sign controller
communication protocol, including information needed to define the interface design,
software codes, message definitions, and message sequences for DMS control and
feedback; and one complete copy of the manufacturer’s documentation for plug-in circuit
cards used in the microcomputer chassis.
Provide documentation that reflects all field changes and software
modifications and revisions prior to the power-on test period for the DMS. Modify the
documentation with any final corrections or adjustments made during the test period.
Submit the documentation to the Engineer within seven days of the successful completion
of the operational testing.
781-3.10 Licensing: Ensure that the manufacturer grants the Department a
nonexclusive, unrestricted license that allows the Department to use, modify, and/or
distribute any and all of the stated communication protocols, sign operating systems,
drivers, and documentation.
781-3.11 Technical Assistance: Ensure that a manufacturer’s representative is
available (preferably on site) to assist the Contractor’s technical personnel at each sign
installation site for sign-to-sign structure installation, sign controller cabinet installation,
and sign-to-controller cabling.
Do not proceed with the initial powering up of the sign(s) without the
permission of the manufacturer’s representative.
781-3.12 Testing: Conduct performance testing of materials and equipment not
previously tested and approved. If the technical data is not considered adequate for
approval, samples may be requested for testing by the Engineer. The contract period will
not be extended for time lost or delays caused by testing prior to the Engineer’s final
approval of any items.
Subject the equipment covered by these specifications to design approval
tests (DATs) and factory demonstration tests (FDTs). APL certification is acceptable in
lieu of DATs and FDTs. Arrange and conduct the tests in accordance with the testing
specifications stated in this section. Unless otherwise specified, the Contractor is
responsible for satisfying all inspection requirements prior to submission for the
Engineer’s inspection and acceptance.
The Engineer reserves the right to witness all DATs and FDTs. The tests
on all or one type of equipment must be completed within five calendar days. The
Contractor shall be financially responsible for testing each DMS.
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Provide five copies of all design approvals, FDTs, stand-alone and
subsystem test procedures, and data forms for the Engineer’s approval at least
60 calendar days prior to the beginning of testing. Include in the test procedures the
sequence in which the tests will be conducted. Obtain the Engineer’s approval of the test
procedures prior to testing the equipment.
Furnish data forms, certified and signed by the manufacturer, containing
all of the data taken, and the quantitative results for all tests. Send one copy of the data
forms to the Engineer.
Provide the test fixtures and test instruments for all the tests.
781-3.12.1 Design Approval and Preshipment Factory Demonstration
Testing: Conduct DATs on one or more samples of each type of equipment, as approved
by the Engineer, to determine whether the equipment design meets project requirements.
Conduct the test in accordance with the approved test procedures as described in this
section. All requirements listed herein take precedence over the applicable NEMA TS 4
standard.
781-3.12.1.1 Temperature and Condensation: Provide results of
the FDTs to the Engineer or his representative prior to shipment. Test requirements
include the following:
1. Stabilize the equipment at -29°F. After temperature
stabilization, operate the equipment without degradation for two hours.
2. Cause moisture to condense on the equipment by
allowing it to warm to room temperature in an atmosphere having a relative humidity of
at least 40% and satisfactorily operate the equipment for two hours while wet.
3. Stabilize the equipment at 165°F. After stabilization,
satisfactorily operate the equipment for two hours without degradation or failure.
781-3.12.1.2 Primary Power Variation: The equipment shall
meet the defined performance specifications when the nominal input voltage is 120 volts,
±11.5 volts. Operate the equipment at extreme limits for at least 15 minutes, successfully
performing FDTs.
781-3.12.1.3 Relative Humidity: The equipment shall meet its
performance specifications when subjected to an ambient operating temperature of 165°F
and a relative humidity of 90%. Maintain the equipment at the above condition for
48 hours. At the conclusion of the 48 hour soak, the equipment shall meet FDT
requirements within 30 minutes of beginning the test.
781-3.12.1.4 Vibration: The equipment, excluding cabinets, shall
show no degradation of mechanical structure, soldered components, or plug-in
components, and shall operate in accordance with the manufacturer’s equipment
specifications after being subjected to the vibration tests required in Section 2.2.5 of the
NEMA TS 4 standard.
781-3.12.1.5 Water Spray Hose Test: Test the fully assembled
DMS by way of a directed water spray hose test. The test shall consist of a 10-minute
soaking of the DMS by way of two constant streams of water. The water spray shall be
delivered by two hoses, 0.625 inch in diameter, with a water throughput of 6 gallons per
minute at 45 pounds per square inch. One hose with a medium spray nozzle shall be
directed at the sign face. The hose setup for the sign face shall be placed 15 feet from the
sign face, be 12 feet in height, and be set at a 45-degree down angle. The second hose
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with a heavy spray nozzle shall be directed at the top of the sign cabinet in the form of
heavy spray. This top hose setup shall be set at 10 feet directly above the sign cabinet
pointing directly down on top of the cabinet. The water shall run continuously for
10 minutes. At the end of the test period, the interior of the sign shall be inspected for
leaks, water/moisture contamination of the electronics, standing water in the base of the
sign, and any other abnormal water/moisture issues. Note any leaks and have them
permanently repaired. Retest until all leaks are stopped. Note all repairs on the as-built
documentation.
781-3.12.2 Preshipment Factory Demonstration Testing: Conduct
FDTs on all units at a Contractor-provided facility. Notify the Engineer a minimum of 30
calendar days before the start of tests. Conduct all tests in accordance with the approved
test procedure contained in this section. All equipment shall have passed the following
individual tests.
781-3.12.2.1 Product Examination Test: Examine each piece of
equipment carefully to verify that the materials, design, construction, markings, and
workmanship comply with the requirements of these specifications.
781-3.12.2.2 Continuity Test: Check the wiring to determine
conformance with the requirements of the appropriate paragraphs in these specifications.
781-3.12.2.3 Operational Test: Operate each piece of equipment
long enough to permit equipment temperature stabilization, and to check and record an
adequate number of performance characteristics to ensure compliance with the
requirements of these specifications.
Have factory personnel make necessary changes and
repairs, making notations of the repairs on the as-built documentation. Retest to verify the
proper operation of the repaired components. Upon satisfactory completion of all preshipment testing, the Engineer will release the sign for shipment.
If a failure pattern develops, the Engineer may direct that
design and construction modifications be made to all units without additional cost to the
Department and/or without an extension of the contract period.
781-3.12.3 Pre-installation Field Testing: Conduct pre-installation tests
on all units at a Contractor-provided facility within the appropriate District. Perform the
tests on each unit supplied to verify that no damage was done to any sign during the
shipment and delivery process. Notify the Engineer a minimum of 10 calendar days
before the start of any tests. Conduct all tests according to the approved test procedures
detailed in this section. Each DMS must pass the individual tests detailed below prior to
installation.
781-3.12.3.1 Product Examination Test: Examine each DMS
carefully to verify that the materials, design, construction, markings, and workmanship
comply with all applicable standards, specifications, and requirements.
781-3.12.3.2 Continuity Test Specifications: Check the wiring to
determine conformance with the applicable standards, specifications, and requirements.
781-3.12.3.3 Operational Test Specifications: Operate each DMS
long enough to permit equipment temperature stabilization, and to check and record an
adequate number of performance characteristics to ensure compliance with applicable
standards, specifications, and requirements.
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781-3.12.3.4 Pre-installation Test Failure Consequence: If any
unit fails to pass an FDT, the unit shall be corrected or another unit substituted in its
place, and the test successfully repeated.
If a unit has been modified as a result of an FDT failure, a
report shall be prepared and delivered to the Engineer prior to the unit’s shipment. The
report shall describe the nature of the failure and the corrective action taken.
If a failure pattern develops, the Engineer may direct that
design and construction modifications be made to all units without additional cost to the
Department or an extension of the contract period.
781-3.12.4 Installed Site Tests: Conduct an approved, stand-alone
equipment installation test at the field site. Test all stand-alone (i.e., non-network)
functions of the field equipment using equipment installed as detailed in the plans, and as
approved by the Engineer.
Complete approved data forms and turn them over to the Engineer
for review, and as a basis for rejection or acceptance. Provide a minimum notice of
30 calendar days prior to all tests to permit the Engineer or his representative to observe
each test.
If any unit fails to pass its stand-alone test, correct the unit or
substitute another unit in its place, then repeat the test.
If a unit has been modified as a result of a stand-alone test failure,
prepare a report describing the nature of the failure and the corrective action taken and
deliver it to the Engineer prior to re-testing the unit. If a failure pattern develops, the
Engineer may direct that design and construction modifications be made to all units
without additional cost to the Department or an extension of the contract period.
781-3.12.5 System Testing: Conduct approved DMS system tests on the
field equipment with the master equipment including, at a minimum, all remote control
functions. Display the return status codes from the sign controller for a minimum of
72 hours. Complete approved data forms and turn them over to the Engineer for review,
and as a basis for rejection or acceptance.
Demonstrate the sign’s ability to display the proper predefined
message or remain blank when power is restored following an AC power interruption.
If the system test fails because of any subsystem component, repair
that component or substitute another in its place, then repeat the test. If a component has
been modified as a result of a system test failure, prepare a report and deliver it to the
Engineer prior to retesting.
781-3.12.6 Operational Testing: After the ADMS system installation and
system testing are successfully completed, conduct one continuous 72-hour, fulloperating test prior to conducting the 60-day Acceptance Test. The Engineer will approve
the type of tests to be conducted. Include in the tests all control, monitoring, and
communication functions of the field equipment by the master equipment.
781-3.12.7 Acceptance Testing: Commence the 60-day test period on the
first day after the successful completion of the approved 72-hour Operational test. During
the 60-day test period, limit downtime due to mechanical, electrical, or other
malfunctions to a maximum total of 5 calendar days. If the equipment fails to operate for
a total of five or more calendar days, testing will be restarted. The Engineer may select to
pause and extend the 60-day test period by the number of days lost by failure and repair
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time in lieu of restarting the full 60-day test. The Engineer will furnish the Contractor
with a letter of approval and completion stating the first and last day of the 60-day test
period.
ARTICLE 781-7 (of the Supplemental Specifications) is deleted and the
following substituted:
781-7 Method of Measurement.
Measurement for payment will be in accordance with the following work tasks.
781-7.1 Furnish and Install: For DMS, the quantity to be paid for will be each
sign and associated support structure furnished, installed, complete in accordance with
the details shown in the plans, warranted, made fully operational, and tested in
accordance with the specifications in this section.
For DMS Support Structure, the quantity to be paid for will be each
structure furnished, installed, complete in accordance with the details shown in the
plans; including posts and supports, catwalks, handrails, footings, excavation, site
grounding, painting, etcand incidentals necessary to complete the work.
The Contract unit price for each HAR system, furnished and installed, will
include furnishing, placement, and testing of all materials and equipment, and for all
tools, labor, equipment, hardware, operational software package(s) and firmware(s),
supplies, support, personnel training, shop drawings, documentation, and incidentals
necessary to complete the work.
The Contract unit price for an RWIS at each field location, furnished and
installed, will include furnishing, placement, and testing of all materials and equipment,
and for all tools, labor, equipment, hardware, operational software package(s) and
firmware(s), supplies, support, personnel training, shop drawings, warranty
documentation, and incidentals necessary to complete the work.
781-7.2 Furnish: The Contract unit price per each DMS, HAR or RWIS system,
furnished, will include all equipment specified in the Contract Documents, plus all
shipping and handling costs involved in delivery as specified in the Contract Documents.
781-7.3 Install: The Contract unit price per each DMS, HAR or RWIS system,
installed, will include placement, and testing of all materials and equipment, and for all
tools, labor, equipment, hardware, operational software package(s) and firmware(s),
supplies, support, personnel training, shop drawings, documentation, and incidentals
necessary to complete the work. The Engineer will supply the equipment specified in the
Contract Documents.
ARTICLE 781-8 (of the Supplemental Specifications) is deleted and the
following substituted:
781-8 Basis of Payment.
Price and payment will be full compensation for furnishing all materials and
completing all work as specified in this section or shown in the plans.
Payment will be made under:
Item No. 781-4
Dynamic Message Sign – each.
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Item No. 781-2
Item No. 781-3
Item No. 781-4
Item No. 781-5
Highway Advisory Radio System – each.
Road Weather Information System – each.
Dynamic Message Sign – each.
Dynamic Message Sign Support Structure – each.
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INTELLIGENT TRANSPORTATION SYSTEMS – MOTORIST INFORMATION
SYSTEMS.
(REV 1-11-12)
ARTICLE 781-1 (of the Supplemental Specifications) is deleted and the
following substituted:
781-1 Description.
Provide Motorist Information Systems meeting the general requirements of 781-2,
the specific requirements for each system as defined in 781-3 through 781-6 of this
specification, and in accordance with the details specified in the Contract Documents.
ARTICLE 781-3 (of the Supplemental Specifications) is deleted and the
following substituted:
781-3 Dynamic Message Signs.
781-3.1 Sign Types: Dynamic Message Signs must meet the requirements of
NEMA TS4-2005. Dynamic Message Signs (DMS) are classified by the type of sign
display and the type of mechanical construction. Provide monochrome, tri-color, or fullcolor signs as shown in the Contract Documents. Use only equipment and components
that meet the requirements of these minimum specifications and are listed on the
Department’s Approved Product List (APL).
781-3.1.1 Front Access DMS: Ensure that front access signs meet the
requirements of NEMA TS4 2005, section 3.2.5.
781-3.1.2 Walk-in DMS: Ensure that walk-in signs meet the requirements
of NEMA TS4 2005, section 3.2.7.
781-3.1.3 Embedded DMS: Embedded DMSs are DMSs that are
typically mounted to Ground Traffic Signs, Overhead Traffic Signs, or Overhead
Cantilever Traffic Signs.
781-3.2 Sign Housing Requirements for all DMS: Ensure that the external skin
of the sign housing is constructed of aluminum alloy 5052 H32 that is a minimum of
0.125 inch thick for walk-in DMS and 0.090 inch thick for front and embedded DMS.
Ensure the interior structure is constructed of aluminum. Ensure that the sign housing
design and appearance is approved by the Engineer. Ensure that no internal frame
connections or external skin attachments rely upon adhesive bonding or rivets.
Ensure the sign enclosure meets the requirements of NEMA TS4 2005,
section 3.1.1. Ensure that all drain holes and other openings in the sign housing are
screened to prevent the entrance of insects and small animals.
Ensure that the sign housing complies with the fatigue resistance
requirements of the fifth edition (2001) American Association of State Highway and
Transportation Officials (AASHTO) Standard Specifications for Structural Supports for
Highway Signs, Luminaires, and Traffic Signals with current addendums. Design and
construct the DMS unit for continuous usage of at least 20 years and the sign structure for
a 50-year design life. Ensure that equipment and structures are designed to withstand
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loads, including a wind load of 150 miles per hour, as defined in the FDOT Structures
Manual without deformation or damage.
Ensure that the top of the housing includes multiple steel lifting eyebolts
or equivalent hoisting points. Ensure hoist points are positioned such that the sign
remains level when lifted. Ensure that the hoist points and sign frame allow the sign to be
shipped, handled, and installed without damage.
Ensure all assembly hardware, including nuts, bolts, screws, and locking
washers less than 5/8 inch in diameter, are type 304 or 316 passivated stainless steel and
meet the requirements of American Society for Testing and Materials (ASTM) F 593 and
ASTM F 594. All assembly hardware greater than or equal to 5/8 inch in diameter must
be galvanized and meet the requirements of ASTM A 307.
Ensure all exterior, excluding the sign face, and all interior housing
surfaces are a natural aluminum mill finish. Ensure signs are fabricated, welded, and
inspected in accordance with the requirements of the current American National Standard
Institute/American Welding Society (ANSI/AWS) Structural Welding Code-Aluminum.
Ensure the sign housing meets the requirements of NEMA TS4 2005,
section 3.2.8 for convenience outlets.
781-3.2.1 Sign Housing for Walk-in DMS: Ensure that exterior seams
and joints, except the finish coated face pieces, are continuously welded using an inert
gas welding method. Limit the number of seams on the top of the housing to a maximum
of three. Stitch weld the exterior housing panel material to the internal structural
members to form a unitized structure.
Ensure that exterior mounting assemblies are fabricated from
aluminum alloy 6061-T6 extrusions a minimum of 0.1875 inch thick. Include a minimum
of three 6061-T6 structural aluminum Z members on the rear of the sign housing in
accordance with the Design Standards, Index 18300. Ensure these structural members run
parallel to the top and bottom of the sign housing and are each a single piece of material
that spans the full length of the sign. Ensure these structural members are attached to the
internal framework of the sign.
Ensure hoist points are attached directly to structural frame
members by the sign manufacturer.
Ensure housing access is provided through an access door that
meets the requirements of NEMA TS4 2005, section 3.2.7.1. Ensure the access door
includes a keyed tumbler lock and a door handle with a hasp for a padlock. Ensure the
door includes a closed-cell neoprene gasket and stainless steel hinges.
Ensure the sign housing meets the requirements of
NEMA TS4 2005, section 3.2.7.3 for service lighting. If incandescent lamps are
provided, ensure they are fully enclosed in heavy-duty shatterproof, protective fixtures.
Ensure that incandescent fixtures include aluminum housing and base, a porcelain socket,
and clear glass inner cover. Ensure that all removable components are secured with set
screws. If fluorescent lamps are provided, ensure they are fitted with protective guards.
Ensure that the sign housing includes emergency lighting that
automatically illuminates the interior in the event of a power outage. Emergency lighting
must be capable of operation without power for a minimum of 90 minutes.
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781-3.2.1.1 Walk-in DMS Work Area: Ensure the walk-in DMS
has a work area that meets the requirements of NEMA TS4 2005, section 3.2.7.2. Finish
all edges of the walkway to eliminate sharp edges or protrusions.
781-3.2.2 Sign Housing for Front Access and Embedded DMS: Ensure
front access and embedded signs meet the requirements of NEMA TS4 2005, section
3.2.4. Ensure access does not require specialized tools or excessive force.
781-3.2.3 Housing Face requirements for all DMS: Ensure the sign face
meets the requirements of NEMA TS4 2005, section 3.1.3. Ensure that all sign face
surfaces are finished with a matte black coating system that meets or exceeds American
Architectural Manufacturers Association (AAMA) Specification No. 2605. Provide
certification that the sign face parts are coated with the prescribed thickness. Except for
Embedded DMS, ensure the sign face includes a contrast border that meets the
requirements of NEMA TS4 2005, section 3.1.6.
781-3.2.3.1 Housing Face for Walk-in DMS: No exposed
fasteners shall be allowed on the housing face. Ensure that display modules can be easily
and rapidly removed from within the sign without disturbing adjacent display modules.
781-3.2.3.2 Housing Face for Front Access and Embedded
DMS: Any exposed fasteners on the housing face shall be the same color and finish as
the housing face. Only captive fasteners shall be used on the housing face.
781-3.2.3.3 External Fascia Panels: If the sign includes external
fascia panels, ensure that they are constructed using aluminum. Finish each fascia panel
with a matte black coating system that meets or exceeds AAMA Specification No. 2605.
781-3.2.3.4 Lens Panel Assembly: If sign includes lens panel
assemblies, ensure they are modular in design, removable, and interchangeable without
misalignment of the lens panel and the light-emitting diode (LED) pixels. The lens panel
assembly must consist of an environmental shielding layer coating to protect and seal the
LEDs and internal electronics. The coating shall be a minimum 90% ultraviolet (UV)
opaque. Lens panels must have a matte black coating that meets or exceeds AAMA
Specification No. 2605. Lens panels must include a mask constructed of 0.080 inch
minimum thickness aluminum. Ensure that the mask is perforated to provide an aperture
for each pixel on the display module. Ensure that the apertures do not block the LED
output at the required viewing angle.
781-3.2.4 Sign Housing Ventilation System: The ventilation systems for
walk-in, front-access, and embedded DMS must meet the requirements of
NEMA TS4 2005, section 3.1.2.
Ensure that air drawn into the sign is filtered upon entry. Ensure
the ventilation system is automatically tested once each day and that it may be tested on
command from remote and local control access locations. Ensure the sign includes a
sensor or a sensor assembly to monitor airflow volume to predict the need for a filter
change. Ensure the ventilation system fans possess a 100,000-hour, L10 life rating.
781-3.2.4.1 Ventilation System for Walk-in DMS: Ensure the
sign includes a fail-safe ventilation subsystem that includes a snap disk thermostat that is
independent of the sign controller. Preset the thermostat at 130°F. If the sign housing’s
interior reaches 130°F, the thermostat must override the normal ventilation system,
bypassing the sign controller and turning on all fans. The fans must remain on until the
internal sign housing temperature falls to 115°F.
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781-3.2.5 Sign Housing Temperature Sensor: Ensure that the sign
controller continuously measures and monitors the temperature sensors. Ensure that the
sign blanks when a critical temperature is exceeded and that the sign will report this event
when polled. Ensure that remote and local computers can read all temperature
measurements from the sign controller.
781-3.2.6 Sign Housing Humidity Sensor: Humidity sensors must detect
from 0 to 100% relative humidity in 1% or smaller increments. Sensors must operate and
survive in 0 to 100% relative humidity, and have an accuracy that is better than plus or
minus 5% relative humidity. A humidistat is not acceptable.
781-3.2.7 Sign Housing Photosensors: Ensure the sign meets the
requirements of NEMA TS4 2005, section 8.8. Ensure that the sensors provide accurate
ambient light condition information to the sign controller for automatic light intensity
adjustment. Ensure that the automatic adjustment of the LED driving waveform duty
cycle occurs in small enough increments that the sign’s brightness changes smoothly,
with no perceivable brightness change between adjacent levels. Ensure that stray
headlights shining on the photoelectric sensor at night do not cause LED brightness
changes.
Ensure that the brightness and color of each pixel is uniform over
the sign’s entire face within a 30-degree viewing angle in all lighting conditions.
781-3.3: Display Modules: Provide display modules manufactured by one source
and fully interchangeable throughout the manufacturer’s sign system(s). Ensure that
removal or replacement of a complete display module or LED board can be accomplished
without the use of special tools.
Ensure display modules contain solid-state electronics needed to control
pixel data and read pixel status.
Ensure that the sign has a full matrix display area as defined in the
glossary of NEMA TS4 2005.
781-3.3.1 LED and Pixel Specifications: Ensure that LED lamps have a
minimum viewing angle of 30 degrees.
Ensure that all pixels in all signs in a project, including operational
support supplies, have equal color and on-axis intensity. Ensure that the sign display
meets the luminance requirements of NEMA TS4 2005, section 5.4, for light emitting
signs connected at full power. Ensure that amber displays produce an overall luminous
intensity of at least 9200 candelas per square meter when operating at 100% intensity.
Provide the LED brightness and color bins that are used in each pixel to the Engineer for
approval. Ensure that the LED manufacturer demonstrates testing and binning according
to the International Commission on Illumination (CIE) 127 (1997) standard.
Ensure that all LEDs operate within the LED manufacturer’s
recommendations for typical forward voltage, peak pulsed forward current, and other
ratings. Component ratings shall not be exceeded under any operating condition.
Provide a pixel test as a form of status feedback to the
transportation management center (TMC) from the local sign controller. Ensure that the
operational status of each pixel in the sign can be automatically tested once a day. Ensure
that the pixel status test determines the functional status of the pixel as defined by the
pixel Failure Status object in National Transportation Communications for ITS Protocol
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(NTCIP) 1203v0239 and does not affect the displayed message for more than half a
second.
Ensure that LEDs are individually mounted directly on a printed
circuit board (PCB).
781-3.3.2 Optical, Electrical, and Mechanical Specifications for
Display Modules: Ensure the display modules are rectangular and have an identical
vertical and horizontal pitch between adjacent pixels. Ensure that the separation between
the last column of one display module and the first column of the next module is equal to
the horizontal distance between the columns of a single display module. Full-color signs
must have a pitch equal to or less than 35mm.
Ensure that the LED circuit board is a NEMA FR4-rated, single
0.062 inch, black PCB. Ensure that no PCB has more than two PCB jumper wires
present. Finish all PCBs with a solder mask and a component-identifying silk screen.
Provide the LED motherboards with a complete conformal coating
of silicone resin with a minimum thickness of 0.01 inch, except for the pixels on the front
of the PCB. All other PCBs must be provided with a complete conformal coating of
silicone resin with a minimum thickness of 0.01 inch. Meet the material requirements of
MIL-I-46058C Military Standard, United States Department of Defense (USDOD).
Ensure that any devices used to secure LEDs do not block air flow
to the LED leads or block the LED light output at the required viewing angle. Ensure that
all components on the LED side of PCBs are black.
Ensure that there are a minimum of two power supplies that are
wired in a parallel configuration for redundancy. Ensure that if one or 25% of the
supplies in a group, whichever is greater, completely fails, the sign shall still be supplied
with enough power to run 40% of all pixels at a 100% duty cycle with an ambient
operating temperature of 165°F.
Ensure that the sign controller continuously measures and monitors
all LED module power supply voltages and provides the voltage readings to the TMC or
a laptop computer on command.
Ensure that LEDs are protected from external environmental
conditions, including moisture, snow, ice, wind, dust, dirt, and UV rays. Do not use
epoxy to encapsulate the LEDs.
781-3.3.3 Display Area for Walk-in DMS: Ensure that the display area is
capable of displaying three lines of 15 characters using an 18 inch font that meets the
height to width ratio and character spacing in the Manual on Uniform Traffic Control
Devices for Streets and Highways 2009 Edition (MUTCD), section 2L.04, paragraphs 05,
06, and 08.
781-3.4 Characters, Fonts, and Color: Ensure that the signs are capable of
displaying American Standard Code for Information Interchange (ASCII) characters 32
through 126, including all uppercase and lowercase letters and digits 0 through 9, at any
location in the message line. Submit a list of the character fonts to the Engineer for
approval.
All signs must be loaded (as a factory default) with a font in accordance
with or that resembles the standard font set described in NEMA TS4 2005, section 5.6.
For signs with a pixel pitch of 35mm or less, ensure the sign is loaded (as a factory
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default) with a font set that resembles the Federal Highway Administration (FHWA)
Series E2000 standard font.
Ensure DMS fonts have character dimensions that meet the MUTCD,
section 2L.04, paragraph 08.
Ensure that full-color signs can display the colors prescribed in the
MUTCD, section 1A.12.
781-3.5 Main Power Supply and Energy Distribution Specifications:
Provide a nominal single-phase power line voltage of 120/240 VAC. Ensure
the DMS meets the requirements of NEMA TS4 2005, section 10.2.
Locate all 120 VAC wiring in conduit, pull boxes, raceways, or control
cabinets as required by the National Electrical Code (NEC). Ensure that no 120 VAC
wiring is exposed inside or outside of the sign housing. Do not use the sign housing as a
wiring raceway or control cabinet.
Provide Type XHHW power cables sized as required by the NEC for
acceptable voltage drops while supplying alternating current to the sign.
Provide surge protective devices (SPD) installed or incorporated in the
sign system by the manufacturer to guard against lightning, transient voltage surges, and
induced current. Ensure that SPDs meet or exceed the requirements of Section 785-2.
Ensure SPDs protect all electric power and data communication connections.
781-3.6 Uninterruptible Power Supply (UPS): If a UPS is required in the
Contract Documents for walk-in DMS, ensure the UPS is installed within the sign
housing or as shown in the Plans. If a UPS is required in the Contract Documents for
front access and embedded signs, ensure the UPS is installed within the control cabinet or
as shown in the Plans. The UPS system must be capable of displaying the current
message on a sign when a power outage occurs. Signs with UPS must be able to operate
on battery power and display text messages for a minimum of two hours. Ensure the
system uses sealed absorbed glass mat (AGM) batteries.
781-3.7 Operational Support Supplies: Furnish the operational support supplies
listed in the table below. Promptly replace any of the supplies used to perform a warranty
repair.
For every group of 10 or fewer DMS provided or required, provide one set
of supplies as follows:
1 each
10 each
1 each
1 each
1 each
1 each
2 each
1 each
1 each
10 each
2 each
1 each
Sign controller and I/O board(s)
LED display modules
Display power supply
Uninterruptible power supply
Cable for connecting interface circuits to daughter
boards
Display module cables
Surge suppression sets
Fan assembly
Time relay for fan control
Each type of small fuse (≤ 10 amp)
Each type of large fuse (> 10 amp)
Each type of sensor
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781-3.8 Components: All components must meet the requirements of
NEMA TS4 2005, section 8.
781-3.8.1 Mechanical Components: Ensure that all fasteners, including
bolts, nuts, and washers less than 5/8 inch in diameter, are passivated stainless steel, Type
316 or Type 304 and meet the requirements of ASTM F 593 and ASTM F 594 for
corrosion resistance. Ensure that all bolts and nuts 5/8 inch and over in diameter are
galvanized and meet the requirements of ASTM A 307. Do not use self-tapping screws.
Ensure that all parts are fabricated from corrosion resistant materials, such as plastic,
stainless steel, aluminum, or brass. Ensure that construction materials are resistant to
fungus growth and moisture deterioration. Ensure that all dissimilar metals are separated
with an inert, dielectric material.
781-3.8.2 Sign Controller: Ensure that the sign controller monitors the
sign in accordance with NEMA TS4 2005, section 9. Ensure the sign monitors the status
of any photocells, LED power supplies, humidity, and airflow sensors. Ensure sign
controllers use fiber optic cables for data connections between the sign housing and
ground-level cabinet.
Ensure that the sign controller meets the requirements of
NEMA TS4 2005, sections 8.9, 8.10. Ensure that the sign controller is capable of
displaying a self-updating time and date message on the sign. Ensure that sign controllers
within ground cabinets are rack-mountable, designed for a standard EIA-310 19 inch
rack, and include a keypad and display.
781-3.8.3 Display System Hardware: Ensure the sign utilizes a system
data interface circuit for communications between the sign controller and display
modules. Except for embedded DMS, ensure that the following components reside inside
the sign housing: sign controller (master or slave), display system interface circuits,
display modules, power supplies, local and remote control switches, LED indicators,
Electronic Industries Alliance (EIA)-232 null modem cables (minimum of 4 feet long for
connecting laptop computer to sign controller), and surge protective devices.
781-3.8.4 Control Cabinet: Provide a control cabinet that meets the
requirements of Section 785-4. Ensure that the minimum height of the cabinet is
46 inches.
Provide a ground control cabinet that includes the following
assemblies and components: power indicator, surge suppression on both sides of all
electronics, communication interface devices, connection for a laptop computer for local
control and programming, a 4 foot long cable to connect laptop computers, a workspace
for a laptop computer, and duplex outlets.
Provide for all telephone, data, control, power, and confirmation
connections between the sign and ground control box, and for any required wiring
harnesses and connectors.
781-3.8.5 Sign Controller Communication Interfaces: Ensure the sign
controller has communication interfaces in accordance with NEMA TS4 2005, section
8.7.1. Ensure that EIA-232 serial interfaces support the following:
Data Bits
Parity
7 or 8 bits
Even, Odd, or None
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Number Stop Bits
1 or 2 bit
Ensure the sign controller has a 10/100 Base TX 8P8C port or a
100 Base FX port Ethernet interface.
For dial-up operations, acquire and bear the charges of installing
and connecting the dial-up telephone line. Provide modems to be retained by the
Department at each location. Provide a user-selectable data transmission rate of up to
19.2 kbps for dial-up operations. Ensure that switching between dial-up, Ethernet, and
multidrop operation does not require sign controller software or hardware modifications.
Ensure that the TMC or a laptop computer can be used to remotely
reset the sign controller.
781-3.9 Message and Status Monitoring: Ensure the DMS provides two modes
of operation: (1) remote operation, where the TMC commands and controls the sign and
determines the appropriate message or test pattern; and (2) local operation, where the sign
controller or a laptop computer commands and controls the sign and determines the
appropriate message or test pattern.
Ensure that the sign can perform the following functions:
1. Control Selection – Ensure that local or remote sign control can
be selected. Ensure that there is a visual indicator on the controller that identifies
whether the sign is under local or remote control.
2. Message Selection – Ensure that the sign controller can select a
blank message or any one of the messages stored in the sign controller’s nonvolatile
memory when the control mode is set to local.
3. Message Implementation – Ensure that the sign controller can
activate the selected message.
Ensure that the sign can be programmed to display a user-defined
message, including a blank page, in the event of power loss.
Ensure that message additions, deletions, and sign controller changes may
be made from either the remote TMC or a local laptop computer. Ensure that each font
may be customized, and modifications to a font may be downloaded to the sign controller
from the TMC or a laptop computer at any time without any software or hardware
modifications.
Ensure that there is no perceivable flicker or ghosting of the pixels during
sign erasure and writing periods.
781-3.10 TMC Communication Specification for all DMS: Ensure that the sign
controller is addressable by the TMC through the Ethernet communications network
using software that complies with the NTCIP 1101 base standard (formerly the
NEMA TS 3.2 -1996 standard), including all amendments as published at the time of
contract letting, the NTCIP Simple Transportation Management Framework, and
conforms to Compliance Level 1. Ensure that the software implements all mandatory
objects in the supplemental requirement SR-781-3-1, FDOT Dynamic Message Sign
NTCIP Requirements, as published on the FDOT State Traffic Engineering and
Operations Office web site at the time of contract letting. Ensure that the sign complies
with the NTCIP 1102v01.15, 2101 v01.19, 2103v02.07, 2201v01.15, 2202 v01.05, and
2301v02.19 standards. Ensure that the sign complies with NTCIP 1103v02.17, section 3.
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Ensure that the controller’s internal time clock can be configured to
synchronize to a time server using the network time protocol (NTP). NTP
synchronization frequency must be user-configurable and permit polling intervals from
once per minute to once per week in one-minute increments. The controller must allow
the user to define the NTP server by internet protocol (IP) address.
Provide communications line circuits that are point-to-point or multipoint,
and that provide full duplex asynchronous data transmissions at the rate shown in the
contract documents or directed by the Engineer.
Assign each sign controller a unique address.
781-3.11 Sign Control Software: Ensure that the sign is provided with computer
software from its manufacturer that allows an operator to program, operate, exercise,
diagnose, and read current status of all sign features and functions using a laptop
computer. Ensure that sign control software provides a graphical representation that
visibly depicts the sign face and the current ON/OFF state of all pixels as well as allows
messages to be created and displayed on the sign. Ensure that the laptop computer and
sign can communicate when connected directly by an EIA-232 cable and via Ethernet.
Ensure that the software will allow communication between multiple users and multiple
signs across the same communication network.
781-3.12 Sign Support Structure: Meet the requirements of 700-2.4.
781-3.13 Installation Requirements: Provide walk-in DMS for locations over
interstate travel lanes. Do not install the sign prior to the availability of electric power.
Verify that any ventilation system incorporated within the sign is operational within
72 hours after sign installation.
Ensure that the location of the lifting eyebolts, left in place or removed, is
sealed to prevent water entry after installation.
Load the initial message libraries on both the sign control software and the
sign controller. The Engineer will furnish the messages to be placed in these libraries.
781-3.14 Documentation: Provide documentation for electronic equipment in
accordance with 603-8.
781-3.15 Licensing: Ensure that the manufacturer grants the Department a license
that allows the Department to use and internally distribute any and all sign
communications protocols, operating systems, drivers, and documentation.
781-3.16 Technical Assistance: Ensure that a manufacturer’s representative is
available to assist the Contractor’s technical personnel during pre-installation testing and
installation.
Do not provide initial power to the sign(s) without the permission of the
manufacturer’s representative.
781-3.17 Environmental Requirements: The DMS must meet the requirements
of NEMA TS4 2005, section 2.
781-3.18 Pre-installation Field Testing: Conduct pre-installation tests on all
units at a Contractor-provided facility within the appropriate District. Perform the tests on
each unit supplied to verify that no damage was done to any sign during the shipment and
delivery process. Notify the Engineer a minimum of 10 calendar days before the start of
any tests. Conduct all tests according to the approved test procedures detailed in this
section. Each DMS must pass the individual tests detailed below prior to installation.
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781-3.18.1 Material Inspection: Examine each DMS carefully to verify
that the materials, design, construction, markings, and workmanship comply with all
applicable standards, specifications, and requirements.
781-3.18.2 Operational Test: Operate each DMS long enough to permit
equipment temperature stabilization, and to check and record an adequate number of
performance characteristics to ensure compliance with applicable standards,
specifications, and requirements.
781-3.18.3 Pre-installation Test Failure Consequence: If any unit fails,
the unit shall be corrected or another unit substituted in its place and the test repeated.
If a unit has been modified as a result of a failure, a report shall be
prepared and delivered to the Engineer. The report shall describe the nature of the failure
and the corrective action taken.
If a failure pattern develops, the Engineer may direct that design
and construction modifications be made to all units without additional cost to the
Department or an extension of the contract period.
781-3.19 Installed Site Tests: Conduct an approved, stand-alone equipment
installation test at the field site. Test all stand-alone (i.e., non-network) functions of the
field equipment using equipment installed as detailed in the Plans and as approved by the
Engineer.
Complete approved data forms and turn them over to the Engineer for
review and as a basis for rejection or acceptance. Provide a minimum notice of
30 calendar days prior to all tests to permit the Engineer or his representative to observe
each test.
If any unit fails to pass its stand-alone test, correct the unit or substitute
another unit in its place, then repeat the test.
If a unit has been modified as a result of a stand-alone test failure, prepare
a report describing the nature of the failure and the corrective action taken and deliver it
to the Engineer prior to re-testing the unit. If a failure pattern develops, the Engineer may
direct that design and construction modifications be made to all units without additional
cost to the Department or an extension of the contract period.
781-3.20 System Testing: Conduct approved DMS system tests on the field
equipment with the master equipment including, at a minimum, all remote control
functions. Display the return status codes from the sign controller for a minimum of
72 hours. Complete approved data forms and turn them over to the Engineer for review,
and as a basis for rejection or acceptance.
Demonstrate the sign’s ability to display the proper predefined message or
remain blank when power is restored following an AC power interruption.
If the system test fails because of any subsystem component, repair that
component or substitute another in its place, then repeat the test. If a component has been
modified as a result of a system test failure, prepare a report and deliver it to the Engineer
prior to retesting.
781-3.21 Operational Testing: After the system testing is successfully
completed, conduct one continuous 72-hour, full-operating test prior to conducting the
60-day acceptance test. The Engineer will approve the type of tests to be conducted.
Include in the tests all control, monitoring, and communications functions of the field
equipment by the master equipment.
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781-3.22 Acceptance Testing: Conduct a 60-day acceptance test after the
successful completion of the approved 72-hour operational test. During the 60-day test
period, limit downtime due to mechanical, electrical, or other malfunctions to a
maximum total of five calendar days. If the equipment fails to operate for a total of five
or more calendar days, testing will be restarted. The Engineer may select to pause and
extend the 60-day test period by the number of days lost by failure and repair time in lieu
of restarting the full 60-day test. The Engineer will furnish the Contractor with a letter of
approval and completion stating the first and last day of the 60-day test period.
ARTICLE 781-7 (of the Supplemental Specifications) is deleted and the
following substituted:
781-7 Method of Measurement.
Measurement for payment will be in accordance with the following work tasks.
781-7.1 Furnish and Install: For DMS, the quantity to be paid for will be each
sign furnished, installed, complete in accordance with the details shown in the plans,
warranted, made fully operational, and tested in accordance with the specifications in this
section.
For DMS Support Structure, the quantity to be paid for will be each
structure furnished, installed, complete in accordance with the details shown in the plans;
including posts and supports, catwalks, handrails, footings, excavation, site grounding,
painting, and incidentals necessary to complete the work.
The Contract unit price for each HAR system, furnished and installed, will
include furnishing, placement, and testing of all materials and equipment, and for all
tools, labor, equipment, hardware, operational software package(s) and firmware(s),
supplies, support, personnel training, shop drawings, documentation, and incidentals
necessary to complete the work.
The Contract unit price for an RWIS at each field location, furnished and
installed, will include furnishing, placement, and testing of all materials and equipment,
and for all tools, labor, equipment, hardware, operational software package(s) and
firmware(s), supplies, support, personnel training, shop drawings, warranty
documentation, and incidentals necessary to complete the work.
781-7.2 Furnish: The Contract unit price per each DMS, HAR or RWIS system,
furnished, will include all equipment specified in the Contract Documents, plus all
shipping and handling costs involved in delivery as specified in the Contract Documents.
781-7.3 Install: The Contract unit price per each DMS, HAR or RWIS system,
installed, will include placement, and testing of all materials and equipment, and for all
tools, labor, equipment, hardware, operational software package(s) and firmware(s),
supplies, support, personnel training, shop drawings, documentation, and incidentals
necessary to complete the work. The Engineer will supply the equipment specified in the
Contract Documents.
7810100.D02
781 Items
ARTICLE 781-8 (of the Supplemental Specifications) is deleted and the
following substituted:
781-8 Basis of Payment.
Price and payment will be full compensation for furnishing all materials and
completing all work as specified in this section or shown in the plans.
Payment will be made under:
Item No. 781-2
Item No. 781-3
Item No. 781-4
Item No. 781-5
Highway Advisory Radio System – each.
Road Weather Information System – each.
Dynamic Message Sign – each.
Dynamic Message Sign Support Structure – each.